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Celestial Time Cycles: Analemma and Lunar Phases Explained

Understanding the intricate relationships between Analemma, Solar Time, Sidereal Time, and Lunar Phases. Explore how the Moon's orbit and rotation synchronize with Earth, causing phenomena like Lunar Months and Synodic Phases. Discover the nuances of Sidereal and Synodic Months and the Moon's gravitational effects on Earth. Unravel the cosmic dance of time and space through celestial mechanics.

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Celestial Time Cycles: Analemma and Lunar Phases Explained

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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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