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I copy from:

[astronomical-almanac.sourcearchive.com]

>>* The following table indicates the differences between the result

* of the IAU formula and Laskar's formula using four different test

* vectors, checking at J2000 plus and minus the indicated number

* of years.

*

* Years Arc

* from J2000 Seconds

* ---------- -------

* 0 0

* 100 .006

* 200 .006

* 500 .015

* 1000 .28

* 2000 6.4

* 3000 38.

* 10000 9400.

*/<<

Does this mean that a star's declination for instance that of Vega at 8000 BC can be off by a whopping 2.6 degrees?

[astronomical-almanac.sourcearchive.com]

>>* The following table indicates the differences between the result

* of the IAU formula and Laskar's formula using four different test

* vectors, checking at J2000 plus and minus the indicated number

* of years.

*

* Years Arc

* from J2000 Seconds

* ---------- -------

* 0 0

* 100 .006

* 200 .006

* 500 .015

* 1000 .28

* 2000 6.4

* 3000 38.

* 10000 9400.

*/<<

Does this mean that a star's declination for instance that of Vega at 8000 BC can be off by a whopping 2.6 degrees?

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