Casting a Rising/Setting Chart
Contents
This section describes how to create a chart for the moment of rising, setting, culmination or anti-culmination of any planet or asteroid on any given day. For rising and setting charts it is possible to choose whether to calculate the chart for the time at which the planet or asteroid would appear to cross the horizon visually, or alternatively to calculate the chart for the time at which its center crosses the true astronomical horizon.
You can create these types of charts without a base chart. However, if you wish to base them on the date of an existing chart, you should have already cast or opened the chart that you wish to use.
1.Choose Rising/Setting from the Chart menu.
2.Select the chart type you want from the Chart Type to Generate list box.
>>> To base the rising/setting chart on the date and location of an existing chart:
3. Select a chart from the Base Chart list box.
>>> To do a rising/setting chart for some other date or place:
4.Fill in the required Date, or click on the Now button for today’s date.
5.Select the Relocated option button and fill in the required location details.
If you are doing a rising or setting chart (as opposed to a culmination or anti-culmination chart), select one of the following Rise/Set Type options
6.Set Rise/Set Type
•"True Altitude" - the rising or setting time is that for which the center of the body crosses the astronomical horizon. This ignores atmospheric refraction, the size of the body and parallax effects.
•"Visual" - the rising or setting time is that for which the leading edge of the body rises or the trailing edge would set visually on an idealized flat horizon. This takes account of atmospheric refraction and the size of the body. In the case of the moon, the lunar parallax is also taken into account.
7.Select the OK button.
A dialog box will appear listing the times of rise, set, culmination and anti-culmination were found. Select one or more entries on the list and then select the OK or Apply button in order to generate the charts. These charts will be added to the list of "Calculated Charts" on the Main Screen.