Night in the sky

[tmz (Tim)]

Does anyone know if the nightinthesky etc personalized star maps from a previous date and location are accurate? Thankyou

[OzEclipse (Joe Cali)]

Do you mean this site?

https://create-au.thenightsky.com/

The night sky (stars) barely changes over a lifetime. That is, except for the minor effect of precession of the Earth's rotational axis, and moving objects such as planets. Calculation of the positions of planets against background stars isn't rocket science, well I guess it sort of is rocket science but not very difficult. So yes they probably are accurate.

Joe

[Wavytone]

Tim at the level of those maps the only things that change from year to year are the moon, and planets.

[Rkonrad (Richard)]

100% stars do move but they are so far away its does not mater for us as it takes centuries to pick up the difference , remember that the stars you see is history

[raymo]

Star atlases are updated every 50 yrs to keep star and DSO positions
accurate for all practical purposes. We are now using atlases of Epoch 2000;
previously it was Epoch 1950.
Some "nearby" stars move enough for their change in position to be seen in
just a few years, such as the change in position of the stars of the bright double
Alpha Cent. which take 80yrs to orbit each other. [actually a triple, but for our present purposes the two bright members are
all we are concerned with].
raymo

[doppler (Rick)]

This is an interesting post illustrating the movement of a close star.

http://www.iceinspace.com.au/forum/s...=star+movement