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The Month PowerPoint Presentation

The Month

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The Month

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  1. The Month

  2. Phases of the Moon • The moon is the second brightest object in the sky. • The shape of the moon changes each day. • Waxing light on right • Waning light on left • The changes are called phases.

  3. Synodic Month • The lunar or synodic month repeats every 29.53 days. • Named phases: new, first quarter, full, last quarter Wikipedia

  4. Sidereal Month • The sidereal month matches the moon to the stars positions. • 27.32 days • Shorter like sidereal day Ian Cameron Smith

  5. Ancient Calendar • Most early cultures used the day and month to mark a year. • Babylon: 12 months, 6 with 29 days and 6 with 30; Add 13th month occasionally • Egypt: 12 months each with 30 days plus 5 extra days • Polynesia: 13 lunar months, drop 1 month occasionally

  6. Lunar Calendar • Many modern cultures use lunar calendars. • Hebrew, Islamic, Han • Han Chinese calendar: • Month starts with the day of the rising new moon • Each month will have either 29 or 30 days • Each year has 353 to 355 days. • Short by 11 days • Leap month to keep the start of the first month between 1/21 and 2/21 • Leap year 383 or 384 days.