Ch 4 Key Terms Flashcards
Apparent solar time
Time that would be indicated by sundial
Declination
Angular distance n or s of celestial equator
Great circle
Circle on surface of a sphere that is curve of intersection of the sphere with a plane passing thru center
International date line
Near longitude 180 deg: date changes by one day
Lunar eclipse
Full Moon passes thru shadow of earth
Mean solar time
Time based on rotation of earth
Meridian
Passes thru poles, on celestial sphere
Moons phases
New moon-wax cres-first q-wax gibbous-full-wan gibbous-3rd q-wan cres-new
Right ascension
Angle measured eastward along celestial equator from vernal equinox to hour passing thru
Sidereal day
Period defined by stars positions
Successive passages of sams star thru meridian
Sidereal month
Period of moons rev with respect to stars
Solar day
Rotation period defined by suns position
Solar eclipse
Passage of new moon in front of sun
Solar month
From full to full phase
Synchronous rotation
Ex: if moon rotated at same rate as earth
