Differences

This shows you the differences between two versions of the page.

--- en:documentation:chart_coordinates [2014/02/02 10:25] – pch
+++ en:documentation:chart_coordinates [2016/08/14 19:16] (current) – [Type of coordinates] pch
@@ Line 26: / Line 26: @@
 Your choice here determines which type of coordinates SkyCharts will display for a selected object on  the **[[status_bar#right|status bar]]**, on the bottom of the chart.
 If you don't check the **Expert mode**, you can choose in the groupbox **Type of coordinates** from four options:
-  * **Apparent true equator, ...**
+  * **Apparent, true equator, equinox and epoch of the date** \\ This is the true apparent position for the equinox of date of the chart, including correction for proper motion, precession, nutation, aberration, light deflection. Normally you want this setting as this is the only to show the real position of the objects.
-  * **Mean of the date ...**
+  * **Mean of the date, mean equator, equinox and epoch of the date** \\ The position for the equinox of date of the chart, including correction only for proper motion and precession. Use this setting only to compare the coordinates with other source that use this system, like printed almanac
-  * **Mean J2000 ...**
+  * **Mean J2000, mean equinox and epoch J2000** \\ The mean position for the date 2000.0, including correction for proper motion and precession at 2000.0. Use this setting only to compare the coordinates with other source that use this system, like printed atlas.
-  * **Astrometric J2000 ...**
+  * **Astrometric J2000 , mean equinox J2000 and epoch of the date** \\ Use the equinox 2000.0 and precession for 2000.0, but proper motion for the current chart date. This setting is only used to compare the coordinates with an astrometry software.
 \\ \\
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