Today’s Sky Map

Easily locate the main stars and planets, and observe that all the sky appears to rotate around Polaris, the North Star! So, the stars rise and set, and the appearance of the sky changes throughout the night…

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If you have any difficulties viewing the sky map, you can view the old version here.

Did you know ?

Every evening, the stars in the sky return to the same place 4 minutes early because the Earth’s movement in its orbit around the sun gives us a slightly different background of stars each night. These 4 minutes represent the difference between the length of a day (24 hours) and that of an earth’s rotation (23 hours and 56 minutes). Scroll the sky day by day with the next day button to see that the stars are rising a little earlier each evening.

Why is the sky constantly changing?

Because of the movements of the Earth:

As the Earth rotates on itself, we see the sky scrolling as if we were on a ride: the whole sky seems to turn the hours around a point near Polaris, the North Star (center of the map). This causes the “rises” and “sets” of the stars. In addition, the stroke of the Earth around the Sun shows us a different portion of the sky depending on the time of year.

Because of the movements of the celestial bodies themselves:

The Sun, Moon, planets, have a perceptible movement over days (or weeks) to the background of stars while stars are so distant that they appear stationary in a human life.

Do you know the printed version of this sky map?

The Stelvision 365 Sky Map is a high quality printed version set on an average latitude suitable for locations between 40°N and 55°N (including Canada, most of the USA, most of Europe and much of Asia). It includes a rotating disc whose operation is exactly the same as the disc you see on this screen! It is therefore valid for all days of the year and all hours of the night. This map can be taken anywhere, no network or battery problem. With its well readable format, its impeccable print and it’s optional small lamp, it is pleasant to use and to offer!

Available on the Shop