Spring
Summer
Autumn
Winter
天の川
月
20XX
M13
M13
M65
M104
M4
M4
M8
M8
M8
M16
M17
NGC6334
NGC6589
NGC6960
NGC6992
NGC7000
NGC7000
NGC7000
IC1318
IC1318
IC1318
IC4603
M31
M31
M31
M31
M31
M33
M45
M45
NGC1499
IC1396
IC1805
M38
M42
M42
M42
M78
NGC2237
NGC2237
NGC2237
NGC2264
IC405
IC434
IC434
IC434
IC443
IC443
IC2177
IC2177
26.8
15.8
9.8
8.0
9.0
C/2007 N3