AS101 Chapter Notes - Chapter 2: Photosphere, Declination, Right Ascension
Document Summary
Solar eclipse: the event that occurs when the moon passes directly between earth and the sun, blocking our view of the sun. Umbra: the region of a shadow that is totally shaded. Penumbra: the portion of a shadow that is only partially shaded. It takes about an hour for the moon to cover the sun: the darkness only lasts for 2-3 minutes, and 7. 5 minutes at most. Annular eclipse: a solar eclipse in which the solar photosphere appears around the edge of the moon in a bright ring, or annulus. Features of the solar atmosphere cannot be seen during an annular eclipse. Lunar eclipse: the da(cid:396)ke(cid:374)i(cid:374)g of the moo(cid:374) (cid:449)he(cid:374) it (cid:373)o(cid:448)es th(cid:396)ough ea(cid:396)th"s shado(cid:449) Saros cycle: an 18-year 11. 33 day period, after which the pattern of lunar and solar eclipses repeats. Declination: the angular distance of an object on the celestial sphere measured north (+) or south (-) from the celestial equator.
