eclipse

An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer. An eclipse is a type of syzygy.The term eclipse is most often used to describe either a solar eclipse, when the Moon's shadow crosses the Earth's surface, or alunar eclipse, when the Moon moves into the Earth's shadow. However, it can also refer to such events beyond the Earth-Moon system: for example, a planet moving into the shadow cast by one of its moons, a moon passing into the shadow cast by its host planet, or a moon passing into the shadow of another moon. A binary star system can also produce eclipses if the plane of the orbit of its constituent stars intersects the observer's position.

30 brightest star in the sky

	V Mag. (m)	Bayer designation	Proper name	Distance (ly)	Spectral class	SIMBAD
0	−26.74		(Sun)	0.000 016	G2 V
1	−1.46	α CMa	Sirius	8.6	A1 V	Sirius A
2	−0.72	α Car	Canopus	310	F0 Ia	Canopus
3	−0.27	α Cen AB (α1 Cen)	Rigil Kentaurus, Toliman	4.4	G2 V/K1 V	Alpha Centauri A
4	−0.04 var	α Boo	Arcturus	37	K1.5 III	Arcturus
5	0.03	α Lyr	Vega	25	A0 V	Vega
6	0.08	α Aur	Capella	42	G8 III, G1 III	Capella A
7	0.12	β Ori	Rigel	770	B8 Iab	Rigel
8	0.34	α CMi	Procyon	11	F5 IV-V	Procyon
9	0.42 var	α Ori	Betelgeuse	640 [3]	M2 Iab	Betelgeuse
10	0.50	α Eri	Achernar	140	B3 Vpe	Achernar
11	0.60	β Cen	Hadar, Agena	350	B1 III	Hadar (Agena)
12	0.77	α Aql	Altair	17	A7 V	Altair
13	0.77	α Cru	Acrux	320	B1 V	Acrux A
14	0.85 var	α Tau	Aldebaran	65	K5 III	Aldebaran
15	0.96	α2 Aur	Capella B	42	G1 III	Capella B
16	1.04	α Vir	Spica	260	B1 III-IV, B2 V	Spica
17	1.09 var	α Sco	Antares	600	M1.5 Iab-b	Antares
18	1.15	β Gem	Pollux	34	K0 IIIb	Pollux
19	1.16	α PsA	Fomalhaut	25	A3 V	Fomalhaut
20	1.25	α Cyg	Deneb	1,550	A2 Ia	Deneb
21	1.30	β Cru	Mimosa, Becrux	350	B0.5 IV	Mimosa
22	1.35	α Leo	Regulus	77	B7 V	Regulus
23	1.51	ε CMa	Adara	430	B2 Iab	Adara
24	1.58	α Gem	Castor	52	A1 V, A2 Vm	Castor
25	1.62	λ Sco	Shaula	700	B1.5-2 IV+	Shaula
26	1.63	γ Cru	Gacrux	88	M4III	Gacrux
27	1.64	γ Ori	Bellatrix	240	B2 III	Bellatrix
28	1.68	β Tau	El Nath	130	B7 III	El Nath
29	1.68	β Car	Miaplacidus	110	A2 IV	Miaplacidus
30	1.70	ε Ori	Alnilam	1,300	B0 Iab	Alnilam