Summer solstice and astronomy I

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1.
solstice
2.
equinox
3.
tropicofcancer
4.
tropicofcapricorn
5.
midnightsun
6.
sunlight
7.
twilight
8.
constellations
9.
planets
10.
astronomy
11.
solarsystem
12.
galacticcenter
13.
stargazing
14.
northernhemisphere
15.
southernhemisphere