As Vulcan is a hypothetical planet, there is no officially accepted ephemeris for the calculation of its position. However, two of the more widely used methods of calculating its position have been included in Solar Fire, and it is possible to choose which of these methods you would like to be used whenever Vulcan’s position is calculated. The possible methods are:
Select one of the “Vulcan Calculation“ options from the “Options“ menu. A check appears to the left of whichever option is currently selected. Any charts which are subsequently calculated will use the newly selected calculation method.
