Origins Quest
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  • The First Three Days of the Earth
    • Reconciling Science and the Bible >
      • Precise Science Confirms the Bible
      • Moses Foresaw Three Discoveries >
        • First Discovery >
          • Mass and Weight of Energy
          • Transformations and Materialization
          • Different Kinds of Rays and Materialization in Empty Space
          • Was Energy the Source of Material
        • Second Discovery
        • Third Discovery >
          • The First Light
          • Separating Light from Darkness
        • Early Ideas about the Beginning
        • An Up-to-Date Ancient Cosmology
        • The Confirmation
        • A Challenging Question
      • Cycles of Darkness and Light >
        • Teaching Children
        • The Idea the Word “Day” Expresses >
          • A Day Not The First Day
          • Not Literal 24-Hour Days
        • How Long Did the First Three Days Last?
        • Earth Rotation and the First Two Days
        • The Duration of the First Day
        • The First Three Cycles of Darkness and Light
      • Was There a Beginning? >
        • An Uncreated Unchanging Universe
        • Evidence for a Beginning >
          • Elements in the Stars
          • Natural Radiation from Space
          • Stars Consume Their Fuel
        • Cosmology and Relativity
        • Instability Determinism Uncertainty, Predestination >
          • Instability
          • Stability and Determinism
          • Predestination Indeterminacy Uncertainty
        • Einstein Science and Philosophy
        • Predestination versus Timely Intervention
    • Simple Elements and Morning Stars >
      • First Evening Energy and Particles >
        • The Energy of Different Kinds of Rays
        • The Most Energetic Rays
        • Natural Particle Production >
          • Simulating the Process
          • Particles from Darkness
        • Darkness in the Bible >
          • Why Darkness Comes First
          • Isaiah on Darkness and Light
      • First Morning-Simple Elements >
        • Doppler Shift Expansion and Cooling >
          • The Beginning of Nucleosynthesis
          • Four Forces
          • Forces Present in Empty Space
        • Nucleosynthesis >
          • The First Elements
          • The First Halt in Nuclei Production
          • Insufficient Complexity
        • The First Light Was Good >
          • The Immediate Cause of the First Light
          • Forming the Light
          • The Confirmation of Darkness and Light
    • Stars that Formed Complex Elements >
      • Second Evening-Expansion >
        • The Expanding Universe >
          • The Giant Atom that Exploded
          • Expansion Not a Big Bang Explosion
          • Expansion Preserves Order
        • Expanding Now But Later What? >
          • Expanding but Uncreated
          • Continuous Creation
          • The Cyclic Version of Continuous Creation
        • The Expanding Universe Prevails
      • Second Morning-Heavy Elements >
        • Heat and Light Make Heavy Elements >
          • Differences in Stellar Composition
          • Nuclear Binding Energy
        • Energy from Fusion and Fission >
          • The Proton-Proton Reaction
          • Nuclear Stability
        • Different Kinds of Fission
        • Burning Helium and Heavier Elements
    • Forming the Sun and Earth >
      • Third Evening-A Dusty Yellow Star >
        • Supernovas Begin the Third Evening
        • Extraterrestrial Water
        • Lighting the Sun
        • The Carbon to Oxygen Reaction
        • The Darkness of the Third Evening
      • Third Morning-The Earth Forms >
        • The Search for a Planet Suitable for Life
    • How Does God Create? >
      • Conditions at the Very Beginning >
        • Creation from Nothing
        • Can We Create Energy? >
          • God Works to Create Energy
          • The Work Necessary to Create the Universe
        • Denial of Creation
        • The Simplest Explanation
        • Creation in a Singularity >
          • Can We Investigate the Instant of Creation?
          • The First Light Has Fluctuations
      • The Next Three Days >
        • Structure in the Genesis Narrative >
          • Examples of Parallelism
          • Parallel Structure in the Creation Narrative
        • Day Four >
          • Not All Stars Formed on the Fourth Day
          • When Did the Stars and Sun Start to Shine?
          • Signs for Animals and People
      • What Is the Origin of the Universe?
    • Appendices >
      • Appendix A
      • Appendix B
  • Design or Luck?
    • Creative Design >
      • Darwin and Adaptive Variation >
        • Finches and Form Adaptation
        • Adaptive Behavior and Structure
        • Intelligence and Autonomy
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        • My Colleagues Reacted
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        • Can Design Be Automatic?
        • Darwinism and Automatic Design
      • How Far Can Small Steps Take Us? >
        • Small Improvements Are Merely Engineering
        • The Vastness of Hyperspace
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          • Wide Coding Overcomes Noise
          • DNA is a Natural Language
          • Common Ancestry
          • Accepted Words Span the Space
        • Is Creative Design Consistent with Darwinism? >
          • Engineering Design
          • A Challenge for Darwinists
    • Thermodynamics >
      • Thermodynamics Information and Creation >
        • The First Law of Thermodynamics
        • The Second Law of Thermodynamics >
          • Entropy
          • Perpetual Motion
        • Information and Order >
          • Entropy Probability and Information
          • Multiplying Probability and Adding Entropy
          • Probability and Information
        • Structure Design Intelligence and Creativity >
          • Structure and Breakdown--Death and Decay
          • Perfection and Beauty
      • Earth-Sun Thermodynamics >
        • A Simple Example of a Thermodynamic Process
        • The Example Applied to the Sun and Earth
      • Another Error about Thermodynamics >
        • A Darwinist Argument about Thermodynamics
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        • What Makes Sunlight Suitable?
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        • Living Organisms and Heat Engines >
          • The Thermodynamics of Life without Sunlight
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          • Darwinism and Thermodynamics
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      • Discovering Alien Life Will Change Nothing
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​​Cycles of Darkness and Light

In this chapter we will discuss what the word "day" means.  How do we define the word "day"?  How do we know when a "day" has passed?
A Criterion for Observing the Passing of a Day
Science requires operational criteria for observing facts. Let’s examine different situations that people call “day” or “night” and see what is common about them.

On Mars a day lasts 24 hours, 39 minutes, 35.24409 seconds, because Mars rotates more slowly that the Earth. The Moon turns so slowly that days last about four weeks or about a month.

On the Earth, darkness and light regularly alternate in cycles. Except on the equator the durations of the dark and bright phases of the cycle vary throughout the year. The sum of the two also varies from 24 hours throughout the year, because the Earth’s orbit is not circular but slightly elliptical. In certain extreme places on Earth the phases of the cycles have other durations. When we go north of the Arctic Circle or south of the Antarctic Circle, nights and days suddenly last for months instead of hours. The arctic regions are alternately the land of darkness at noon and the land of the midnight Sun. At the poles of the Earth there are six months of darkness and six months of daylight. There a day lasts a year. The Sun provides the daylight at the poles of the Earth just as it does everywhere else on the Earth, but it produces days of markedly different durations.

What is common about days on Mars, on the Moon, on Earth at the poles, and on Earth in the equatorial or temperate zones? When all of nature is dark, we say it is “night,” but when nature is bright, we call it “day.” The light we see depends on our location or point of view. In different situations the duration of a day may vary considerably, but the definition remains the same throughout the universe and at all times. A day is one cycle of alternation between darkness and light.

In outer space, it is always day when the observer is close to the Sun. The Sun’s daylight phase has lasted almost 5 000 million years. The Earth as a whole is always in daylight.

How far do we have to go from the Sun to find night? The Moon gives us a criterion for finding where and when night begins and ends.

Darkness does not have to be complete to be the darkness of night. The most intense nighttime light is that of a full Moon at midnight. We may therefore define the boundary between day and night as the place where the intensity of sunlight diminishes to the brightness of the full Moon at midnight. The Moon and Sun as seen from the Earth appear to have the same size. The intensity of moonlight is 2.09 parts per million of the intensity of sunlight. Therefore the boundary between day and night lies where sunlight drops to the intensity of moonlight on Earth. Put the other way around, noonday sunlight is 478 000 times as intense as the light of the full Moon at midnight. Light intensity decreases in proportion to the square of the distance from the source. The square root of 478 000 is 692. Day ends and night begins when we go out 692 times the distance of the Earth from the Sun. The average distance to Pluto is 39.5 times the distance of the Earth from the Sun, so the boundary of night is 17.5 times farther away than Pluto. Therefore the entire solar system is always in daylight. At any point close to the Sun a planet or asteroid is in perpetual day. Far out in the darkness is perpetual night, until we come close to another star.

​From all the foregoing, we can see that the duration of a day is not an essential part of a scientific criterion for observing the passing of a day. The scientific criterion is as follows: A day is a natural cycle of darkness and light.
An Ancient Criterion
Some people are surprised to discover that the scientific criterion above appeared very early in ancient times, in the Bible. Its creation narrative organizes the stages of creation in days. God created the heavens and the Earth at the beginning of the first evening, and ended by creating the first human couple on the sixth morning.

​In our modern way of thinking a day is 24 consecutive hours. On first reading the Genesis narrative, many people think that Moses was wrong about the timing of creation. To them Moses seems to say that the creation of the universe took just 6 x 24 = 144 consecutive hours. That contradicts what science now tells us, that the first stars are thousands of millions of years older than the Earth and Sun, and the first light is older still. But the discrepancy disappears when we ask who was first to use the word day in the creation narrative.
Teaching Children
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  • Home
  • The First Three Days of the Earth
    • Reconciling Science and the Bible >
      • Precise Science Confirms the Bible
      • Moses Foresaw Three Discoveries >
        • First Discovery >
          • Mass and Weight of Energy
          • Transformations and Materialization
          • Different Kinds of Rays and Materialization in Empty Space
          • Was Energy the Source of Material
        • Second Discovery
        • Third Discovery >
          • The First Light
          • Separating Light from Darkness
        • Early Ideas about the Beginning
        • An Up-to-Date Ancient Cosmology
        • The Confirmation
        • A Challenging Question
      • Cycles of Darkness and Light >
        • Teaching Children
        • The Idea the Word “Day” Expresses >
          • A Day Not The First Day
          • Not Literal 24-Hour Days
        • How Long Did the First Three Days Last?
        • Earth Rotation and the First Two Days
        • The Duration of the First Day
        • The First Three Cycles of Darkness and Light
      • Was There a Beginning? >
        • An Uncreated Unchanging Universe
        • Evidence for a Beginning >
          • Elements in the Stars
          • Natural Radiation from Space
          • Stars Consume Their Fuel
        • Cosmology and Relativity
        • Instability Determinism Uncertainty, Predestination >
          • Instability
          • Stability and Determinism
          • Predestination Indeterminacy Uncertainty
        • Einstein Science and Philosophy
        • Predestination versus Timely Intervention
    • Simple Elements and Morning Stars >
      • First Evening Energy and Particles >
        • The Energy of Different Kinds of Rays
        • The Most Energetic Rays
        • Natural Particle Production >
          • Simulating the Process
          • Particles from Darkness
        • Darkness in the Bible >
          • Why Darkness Comes First
          • Isaiah on Darkness and Light
      • First Morning-Simple Elements >
        • Doppler Shift Expansion and Cooling >
          • The Beginning of Nucleosynthesis
          • Four Forces
          • Forces Present in Empty Space
        • Nucleosynthesis >
          • The First Elements
          • The First Halt in Nuclei Production
          • Insufficient Complexity
        • The First Light Was Good >
          • The Immediate Cause of the First Light
          • Forming the Light
          • The Confirmation of Darkness and Light
    • Stars that Formed Complex Elements >
      • Second Evening-Expansion >
        • The Expanding Universe >
          • The Giant Atom that Exploded
          • Expansion Not a Big Bang Explosion
          • Expansion Preserves Order
        • Expanding Now But Later What? >
          • Expanding but Uncreated
          • Continuous Creation
          • The Cyclic Version of Continuous Creation
        • The Expanding Universe Prevails
      • Second Morning-Heavy Elements >
        • Heat and Light Make Heavy Elements >
          • Differences in Stellar Composition
          • Nuclear Binding Energy
        • Energy from Fusion and Fission >
          • The Proton-Proton Reaction
          • Nuclear Stability
        • Different Kinds of Fission
        • Burning Helium and Heavier Elements
    • Forming the Sun and Earth >
      • Third Evening-A Dusty Yellow Star >
        • Supernovas Begin the Third Evening
        • Extraterrestrial Water
        • Lighting the Sun
        • The Carbon to Oxygen Reaction
        • The Darkness of the Third Evening
      • Third Morning-The Earth Forms >
        • The Search for a Planet Suitable for Life
    • How Does God Create? >
      • Conditions at the Very Beginning >
        • Creation from Nothing
        • Can We Create Energy? >
          • God Works to Create Energy
          • The Work Necessary to Create the Universe
        • Denial of Creation
        • The Simplest Explanation
        • Creation in a Singularity >
          • Can We Investigate the Instant of Creation?
          • The First Light Has Fluctuations
      • The Next Three Days >
        • Structure in the Genesis Narrative >
          • Examples of Parallelism
          • Parallel Structure in the Creation Narrative
        • Day Four >
          • Not All Stars Formed on the Fourth Day
          • When Did the Stars and Sun Start to Shine?
          • Signs for Animals and People
      • What Is the Origin of the Universe?
    • Appendices >
      • Appendix A
      • Appendix B
  • Design or Luck?
    • Creative Design >
      • Darwin and Adaptive Variation >
        • Finches and Form Adaptation
        • Adaptive Behavior and Structure
        • Intelligence and Autonomy
      • Biological Structure and Reproduction
      • Adaptive Form
      • Darwin and Darwinism >
        • The Development of the Sciences
        • Contrasting Darwinism and Thermodynamics
        • Darwinism Today
      • The Limits of Automatic Design
    • Why Are Not All Darwinists Rich? >
      • Automatic Design: Artificial and Natural >
        • The Automatic Lens-Design Program
        • Company Top Secret
        • Comparing Evolution and Lens Design
        • My Colleagues Reacted
      • Conclusion-Darwinism Does Not Work >
        • Can Design Be Automatic?
        • Darwinism and Automatic Design
      • How Far Can Small Steps Take Us? >
        • Small Improvements Are Merely Engineering
        • The Vastness of Hyperspace
        • Primordial Alphabet Soup >
          • Wide Coding Overcomes Noise
          • DNA is a Natural Language
          • Common Ancestry
          • Accepted Words Span the Space
        • Is Creative Design Consistent with Darwinism? >
          • Engineering Design
          • A Challenge for Darwinists
    • Thermodynamics >
      • Thermodynamics Information and Creation >
        • The First Law of Thermodynamics
        • The Second Law of Thermodynamics >
          • Entropy
          • Perpetual Motion
        • Information and Order >
          • Entropy Probability and Information
          • Multiplying Probability and Adding Entropy
          • Probability and Information
        • Structure Design Intelligence and Creativity >
          • Structure and Breakdown--Death and Decay
          • Perfection and Beauty
      • Earth-Sun Thermodynamics >
        • A Simple Example of a Thermodynamic Process
        • The Example Applied to the Sun and Earth
      • Another Error about Thermodynamics >
        • A Darwinist Argument about Thermodynamics
        • Sunlight and Earth Temperature
        • What Makes Sunlight Suitable?
      • The Night Sky Is Dark >
        • Olbers and his Paradox
        • A Black Forest and the Stars >
          • Seeing to the Far Limit of the Universe
          • The Limit of the Known Universe
          • Ordinary Darkness
      • A Planet Suitable for Life
      • The Thermodynamics of Life >
        • Living Organisms and Heat Engines >
          • The Thermodynamics of Life without Sunlight
        • Entropy Thermodynamics and Prigogine >
          • Darwinism and Thermodynamics
      • Thermodynamics and the Universe >
        • Formless and Dark but Energetic and Orderly >
          • Entropy and Penrose
        • Creative Agencies and Their Characteristics
    • Complex Order-Life-Intelligence >
      • Random Action and Complexity
      • Does Matter Organize Itself?
      • Complexity Can Be Specified
      • Information and Physical Laws
      • Did Our Life Begin Elsewhere?
      • Discovering Alien Life Will Change Nothing
      • Creative Design Suits the Universe for Life
    • The Quest Continues
  • Creationism that Scientists Can Accept
  • About
  • Contact
  • DVD
  • Booklet