New post

Measuring precession over time & viewing eclipse back in time

Originally from ticket #7308.


1st Question: If I entered a specific date about 6,000 years ago, does the
program tell/show me where “North” is vis-à-vis the Earth’s axis of


(Today, the Earth’s axis of rotation is roughly pointing towards Polaris,
and it was pointed towards a difference star.


Polaris will not always be the Pole Star or North Star. The Earth's rotation
axis happens to be pointing almost exactly at Polaris now, but in 13,000
years the precession of the rotation axis will mean that the bright star
Vega in the constellation Lyra will be approximately at the North Celestial
Pole, while in 26,000 more years Polaris will once again be the Pole Star.)


2nd Question: If I entered a specific date about 5,000 years ago, will the
program tell me if their was a eclipse that day?

1 comment

  • 0
    Dave Whipps

    1. Remember that "North" is DEFINED by the position of Earth's axis of rotation. I think you probably mean, "does Starry Night take into account precession, and move the north celestial pole?" The answer to that is yes.

    2. Yes, Starry Night has the ability to show eclipses far into the past and the future, and the "Event Finder" will work to help find them.

Please sign in to leave a comment.