Pre-Setting Calculation Options

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...

•Geocentric Latitudes - Whether or not the entered latitude is converted to a geocentric latitude. Most astrologers do not use geocentric latitude.

•Lunar Parallax - Whether or not a correction is made to the moon’s position due to location. Most astrologers do not correct the moon for parallax.

•Lunar Node Type - Whether the true node or mean node is calculated. Astrologers today are fairly evenly divided on this issue.

•Vulcan Calculation - Which method of calculating Vulcan’s position is used. This option is only relevant if you intend to display Vulcan in your chart. Most astrologers do not display Vulcan.

•Part of Fortune - 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.

•MC in Polar Regions – Which formula is used to calculate the position of the MC for charts cast in locations when the Sun does not rise across the horizon during the day.

>> To alter any of the above options

1.Select the Edit Settings item from the "Preferences" menu on the Main Screen.

2.Select the Calculations tab.

3.Alter any settings as required

See Changing Preferences for more information on these options.