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Final Topics in Space Science SCI 2201 Solar and Lunar Eclipse & Reason for the Seasons
Meteor Showers • On most moonless nights, you’ll see 4 or 5 meteors per hour. • Major annual meteor showers are named after constellations • Perseids Jul 17-Aug24 • Leonids Nov 14-21
Comets – icy visitors from beyond the solar system • Dirty snowballs • Some are captured in a regular orbit about the Sun • Haley’s, Hale Bop • Kuiper belts • Just beyond Pluto • Oort cloud • 1000X beyond Pluto
Moon Patterns • Moon moves east to the East with respect to the Sun by about one diameter per hour • Counterclockwise if viewed from above • Moon completes phase cycle in 29.5 days • Time of “moon rise” grows later each day • The Moon rotates and revolves in the same length of time, 27.3 days.
Eclipse • When either the Sun or the Moon crosses into the shadow cast by the other, an eclipse occurs.
Umbra: Inner core of total darkness • Penumbra: Outer, partial shadow
Lunar Eclipse • Moon passes through the shadow of the Earth.
Solar Eclipse • Earth passes through the shadow of the Moon.
Final Topics in Space Science SCI 2201 Solar and Lunar Eclipse & Reason for the Seasons UT Astronomy Course: Great link!!! Fred Espenak's Eclipse Home Page