Astronomy & Telescope Glossary
The following glossary terms cover both general astronomy and telescopes. For a list of commonly-used abbreviations, see Astronomy Abbreviations.
A: Aberration - Azimuth
B: Bailey's beads - Bolide
C: Catadioptric - Crescent moon
D: Dark adaptation - Dust lane
E: Earthshine - Exit pupil
F: f-number - Focuser
G: Galaxy - Green flash
H: Harvest moon - HST
I: Inclination - ISS
J: Jovian - JPL
K: Kuiper Belt -
L: Lens - Lunar phases
M: Magnifying power - Monocular
N: Nadir - North Star
O: Objective - Outer planets
P: Parabolic mirror - Prominence
R: Radiant - Right ascension
S: Satellite - Superior planets
T: Telecompressor - True field
U: Umbra -
V: Visual binary - Visual magnitude
W: Waning moon - Widefield eyepiece
Z: Zenith - Zodiacal light
