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Analemma

Analemma. Time. Mean Solar Time: Time based on the average time between meridian crossings of the Sun. Each day is exactly 24 hours. Apparent Solar Time: The actual hour angle of the Sun + 12 hours Sidereal Time: The hour angle of the vernal equinox. Repeats every 23 hr 56 min 4 sec.

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Analemma

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  1. Analemma

  2. Time • Mean Solar Time: Time based on the average time between meridian crossings of the Sun. Each day is exactly 24 hours. • Apparent Solar Time: The actual hour angle of the Sun + 12 hours • Sidereal Time: The hour angle of the vernal equinox. Repeats every 23 hr 56 min 4 sec.

  3. Moon Orbits the Earth

  4. Lunar Phases

  5. Moon’s Rotation Matches Orbit • Sidereal rotation period is the same as the sidereal orbital period: 27.3 days • Moon shows the same “face” to the Earth • Caused by Earth’s tidal force on the Moon

  6. Lunar Month • Based on the motion of the Moon around the Earth • Sidereal month: 27.321662 days. Defined relative to the stars. • Synodic month: 29.530589 daysPhase period; New Moon to New Moon

  7. Synodic vs. Sidereal Month

  8. The Moon from Earth

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