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Mike G
Mike G
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Stellarium 0.14 or later has a checkbox under Configuration, Tools, Planetarium options: Include nutation. If I uncheck it, the RA/Dec and Dec of date for those stars matcheson 2016/1/1 match yours within 0.2 arcsecond.

Some libraries distinguish between astrometric and apparent positions, aberration making up to 20 arcseconds difference.

Stellarium 0.14 or later has a checkbox under Configuration, Tools, Planetarium options: Include nutation. If I uncheck it, the RA/Dec of date for those stars matches yours.

Some libraries distinguish between astrometric and apparent positions, aberration making up to 20 arcseconds difference.

Stellarium 0.14 or later has a checkbox under Configuration, Tools, Planetarium options: Include nutation. If I uncheck it, the RA and Dec of date for those stars on 2016/1/1 match yours within 0.2 arcsecond.

Some libraries distinguish between astrometric and apparent positions, aberration making up to 20 arcseconds difference.

rewrote, definitely nutation
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Mike G
Mike G
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I would focus on the differences in 2016 declination: in Orion, yours are all ~10" to the north of Stellarium'sStellarium 0. If one code corrects for aberration14 or later has a checkbox under Configuration, Tools, Planetarium options: orInclude nutation,. and the other does notIf I uncheck it, that might accountthe RA/Dec of date for itthose stars matches yours.

Some libraries distinguish between astrometric and apparent positions, Data points in different parts of the sky would help narrow it downaberration making up to 20 arcseconds difference.

I would focus on the differences in 2016 declination: in Orion, yours are all ~10" to the north of Stellarium's. If one code corrects for aberration or nutation, and the other does not, that might account for it. Data points in different parts of the sky would help narrow it down.

Stellarium 0.14 or later has a checkbox under Configuration, Tools, Planetarium options: Include nutation. If I uncheck it, the RA/Dec of date for those stars matches yours.

Some libraries distinguish between astrometric and apparent positions, aberration making up to 20 arcseconds difference.

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Mike G
Mike G
  • 18.8k
  • 1
  • 27
  • 65

I would focus on the differences in 2016 declination: in Orion, yours are all ~10" to the north of Stellarium's. If one code corrects for aberration or nutation, and the other does not, that might account for it. Data points in different parts of the sky would help narrow it down.