AST 165 Lecture Notes - Lecture 4: Sun-2
Document Summary
Moon phases: as moon orbits, lit part of the moon seems to change in 8 phases. Waxing crescent: partially illuminated less than way. When moon is on opposite side of sun. Full moon: entirely illuminated in full circle shape. Decreasing stages (waning): when moon is close to the. Waning crescent: partially illuminated less than way. 1st quarter (don"t): capital d -- start off semester on a bad note, start at d grade level. 3rd quarter (class): capital c -- as semester continues, work your way up to c grade level. Phases are how much of moon"s lit half we can see from. Moon"s surface is always half (50%) illuminated. Where the sun is in relation to earth in relation to the moon (sun -> earth -> moon) Moon"s orbit around earth isn"t always perfect circle (hence waxing and waning stages) Increasing stages (waxing): when moon is far from the sun. Decreasing stages (waning): when moon is close to the sun.
