There are several options in Solar Fire that affect the calculation of the chart. If you wish to alter them, then you must do so before the chart is cast, as you cannot set them on the “New Chart Data Entry” screen.
These options are:
•Lunar Node - Whether the true node or mean node is calculated. Astrologers today are fairly evenly divided on this issue.
•Part of Fortune Type - Which formula is used to calculate the position of the Part of Fortune in the chart, i.e. whether to use ASC+Moon-Sun for both day and night births, or to change it to ASC+Sun-Moon for night births.
•Black Moon - Which method of calculating the moon’s position is used, either true apogee or mean apogee.
•Geocentric Correction to Latitude - Whether or not the entered latitude is converted to a geocentric latitude. Most astrologers do not use geocentric latitude.
•Parallax Correction to Moon - Whether or not a correction is made to the moon’s position due to location. Most astrologers do not correct the moon for parallax.
>> To alter any of the above options
1.On the Main Screen, from the Preferences menu, select Edit Settings.
2.Select Calculations from the list.
3.Alter any settings as required.
See Changing Preferences for more information on these options.
