Astronomy

How to fix a Direction in the context of universe?

How to fix a Direction in the context of universe?


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My question is regarding the direction/orientation of earth. Is it a constant with reference to universal parameters?


I had a nice long answer all mapped out, then I came across a similar (identical?) question… refer answer here: How does the earth's plane of orbit (ecliptic) vary over time?

Basically it is changing about 1.4 degrees per 10000 years about now, but that will change chaotically over longer periods.


How to fix a direction in the context of universe?

Simple (or not so simple): Use the remote stars, or even better, use the extremely remote quasars. The former is what astronomers have done for centuries, culminating in the Hipparcos Celestial Reference Frame. The latter is what is currently used to define the International Celestial Reference Frame.

Note very well: The ICRF is not universal. There is no such thing as a universal reference frame thanks to the non-Euclidean nature of space and time. The ICRF does however quite work nicely across the expanse of the solar system.


My question is regarding the direction/orientation of earth. Is it a constant with reference to universal parameters?

No, it is not. The Earth's axis of rotation precesses thanks to gravitational torques by the Moon and the Sun on the Earth's equatorial bulge.


Watch the video: Direction Not Available on iPhone Maps? - Heres How to Fix! (January 2023).