| A | B |
|---|
| relative location | location of object from your perspective |
| absolute location | location of object doesn't change regardless of perspective |
| zenith | location in sky directly above you |
| altitude | angular distance above the horizon |
| azimuth | angular distance in the sky away from north |
| right ascenscion | "longitudinal" lines on the celestial sphere |
| declination | "latitudinal" lines on the celestial sphere |
| celestial sphere | an imaginary sphere around Earth where stars, etc. are located |
| the ecliptic | the apparent path of the Sun around Earth |
| celestial poles | where Earth's north and south poles project onto the celestial sphere |
| celestial equator | where Earth's equator projects onto the celestial sphere (declination = 0 degrees) |
| degrees | use to measure altitude, azimuth and declination |
| hours, minutes, ... | used to measure right ascension |
| vernal equinox | used as the celestial meridian (RA = 0 hours) |
