Understanding a Day

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Questions and Answers

What is a solar day?

  • The period of time it takes the Earth to rotate once relative to the Sun (correct)
  • The period of time it takes the Earth to rotate once relative to the stars and fixed points
  • The period of time it takes the Earth to rotate once relative to the fixed stars
  • The period of time it takes the Earth to rotate once relative to the Moon

What is the international standard for starting the day?

  • At midnight (00:00) (correct)
  • At the exact moment the Sun hits the horizon
  • At sunrise or sunset
  • At midnight or noon

How many hours are in a day?

  • 20
  • 12
  • 24 (correct)
  • 30

What is twilight?

<p>The period of time when the Sun is between 6 and 12 degrees below the horizon (C)</p> Signup and view all the answers

How many seconds are in a minute?

<p>60 (A)</p> Signup and view all the answers

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Study Notes

Definition

  • A day is a unit of time, equivalent to 24 hours
  • It is the period of time it takes the Earth to rotate once on its axis

Structure

  • A day is divided into 24 equal periods, called hours
  • Each hour is divided into 60 minutes
  • Each minute is divided into 60 seconds

Types of Days

  • Solar day: the period of time it takes the Earth to rotate once relative to the Sun
  • Sidereal day: the period of time it takes the Earth to rotate once relative to the fixed stars (23 hours 56 minutes 4.09 seconds)

Daylight and Night

  • Daylight: the period of time when the Sun is above the horizon
  • Night: the period of time when the Sun is below the horizon
  • Twilight: the period of time when the Sun is between 6 and 12 degrees below the horizon

Day in Different Cultures

  • In some cultures, the day begins at sunrise or sunset
  • In others, the day begins at midnight or noon
  • The international standard is to begin the day at midnight (00:00)

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