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Listen • 0:59 Skywatch Monday Dec 21.2020 The sky is filled with invisible lines that trace out the paths of the sun, moon and planets, the extensions of earth coordinates and the patterns of the constellations. While constellation pictures are imaginary, it’s important to note that the astronomer’s coordinate lines are not imaginary: they’re real, but they just happen to be invisible. These “ghost lines in the sky” help us to make sense and order of the Universe. One such line traces out the division between the earth and the sky, and is called the horizon. Another line, the celestial meridian, begins due north, reaches the top of the sky - the zenith - and ends in the south. The earth’s equator projected out into space traces the line of the celestial equator across the heavens, while the ecliptic, the path of the earth’s orbit about the sun, serves as a calendar in the sky, showing us where the sun should be on any given day of the year.

Nile riverEgypt generalNicholas copernicuArthur eddingtonTycho braheIsaac newtonJohannes keplerMonday decTuesday decWednesday decThursday decFriday decChristmas dayநைல் நதிஎகிப்து ஜநரல்ஆர்தர் எடிங்டன்