# Heliocentric correction (dialog)

The “Heliocentric correction” allows an user to compute heliocentric correction for specified star and date of observation. It can also convert the geocentric date into heliocentric one and vice versa.

## Activating the dialog

The dialog can be activated:

1. from the main menu: Tools ‣ Heliocentric correction.

## Computing heliocentric correction

Computing heliocentric correction

(1) Select the desired output value.

Enter object’s right ascension to the text box (2) in hours. Use the hexagesimal format, separate the fields by a space character.

Enter object’s declination to the text box (3) in degrees. Use the hexagesimal format, separate the fields by a space character.

Click the ellipsis button (4) to retrieve object’s coordinates from a table of predefined objects or a catalog of variable stars.

Enter a Julian date into the text box (5) or date and time into the text box (6). As you type in the data, corresponding value of heliocentric correction in days is updated in the last text box (7).

## Computing heliocentric Julian date

Computing heliocentric Julian date

(1) Select the desired output value.

Enter object’s right ascension to the text box (2) in hours. Use the hexagesimal format, separate the fields by a space character.

Enter object’s declination to the text box (3) in degrees. Use the hexagesimal format, separate the fields by a space character.

Click the ellipsis button (4) to retrieve object’s coordinates from a table of predefined objects or a catalog of variable stars.

Enter a geocentric (observed) Julian date into the text box (5) or the date and time into the text box (6). As you type in the data, corresponding value of heliocentric Julian date is updated in the last text box (7).

## Computing geocentric Julian date

Computing geocentric Julian date

(1) Select the desired output value.

Enter object’s right ascension to the text box (2) in hours. Use the hexagesimal format, separate the fields by a space character.

Enter object’s declination to the text box (3) in degrees. Use the hexagesimal format, separate the fields by a space character.

Click the ellipsis button (4) to retrieve object’s coordinates from a table of predefined objects or a catalog of variable stars.

Enter a heliocentric Julian date into the text box (5) or date and time into the text box (6). As you type in the data, corresponding value of geocentric (observed) Julian date is updated in the last text box (7).

See also

JD converter (dialog), Air mass coefficient (dialog)