Astronomy Final Flashcards
1
Q
Wein’s law states that:
A
- Hotter objects - bluer
- Cooler objects - redder
2
Q
Advantages of Horizon Coordinate System:
A
- oriented towards sky the observer actually sees
- intuitive & easy too visualize and use
3
Q
Disadvantages of Horizon Coordinate System:
A
- changes with time & location of observer
- not suitable for describing general position of stars
- only good for an instant in time
4
Q
Co-latitude =
A
co-lat. = 90° - observer’s latitude
5
Q
Stellar Diurnal Motion
A
15° east > west per hour
6
Q
Stellar Annual Motion
A
1° per day east > west per day
7
Q
Sidereal Day
A
23 hours 56’ 04”
8
Q
Advantages of Celestial Coordinate System:
A
- same for every observer
- changes very little over time
9
Q
Disadvantages of Celestial Coordinate System:
A
- not naturally oriented towards observer’s sky
10
Q
Meridian Altitude =
A
MA = co-latitude + declination
11
Q
Hour Angle =
A
HA = Sidereal Time - Right Ascension
12
Q
Seasons Depend on:
A
- tilt of axis
- period of revolution
- observer’s latitude
13
Q
Perigee:
A
Moon’s closest point to Earth
14
Q
Apogee:
A
Moon’s furthest point from Earth
15
Q
Perihelion:
A
Earth’s closest point to the Sun
