Solar Coordinates Converter

A small utility to convert between equatorial (R.A., Dec.) and solar helioprojective (solar x, y) coordinates of a specified target on and around the Sun.

Select conversion Equatorial (R.A., Dec.) --> Helioprojective (x, y)
Helioprojective (x, y) --> Equatorial (R.A., Dec.)

Specify solar equatorial coordinates

R.A.: Dec.: P angle:

Get from JPL Horizons

Pointing

X: Y:

R.A.: Dec.:

Pointing

R.A.: Dec.:

X: Y:

Status window

Notes

Coordinates of the Sun are astrometric ICRF/J2000 coordinates from JPL Horizons. Atmospheric refraction is not taken into account. Physical ephemeris of the Sun are also from JPL Horizons. An explanation of the calculation methods used in this tool is given here.

Version history

Acknowledgements

Hvar Observatory, Faculty of Geodesy, University of Zagreb, http://oh.geof.unizg.hr
Czech ARC node Ondřejov, http://www.asu.cas.cz/alma
Astronomical Society Anonymus, Valpovo, Croatia, http://www.anonymus.hr
JPL Horizons, http://ssd.jpl.nasa.gov/horizons.cgi

Created by I. Skokić

Hvar Observatory,
Faculty of Geodesy, University of Zagreb, Kačićeva 26, HR-10000 Zagreb, Croatia

Change default location (ALMA)
Lat. (N): Lon. (E): Alt.: m