Differences

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

--- en:documentation:date_time [2014/02/07 20:24] – [Animation] pch
+++ en:documentation:date_time [2017/02/25 22:56] (current) – [Setting the date and time manually] pch
@@ Line 35: / Line 35: @@
 ==== Setting the date and time manually ====
-You need to **uncheck** the //Use system time// checkbox when you want to display a chart **for a date / time in the future or past**. You can set the date and time by usage of the appropriate combo boxes. SkyChart can calculate with dates in the range from -20000 to +20000 years. However, the planet positions are only properly calculated for dates from -3000 to +3000. Beware with the negative years: 1BC is the year 0 and 2BC is the year -1. Note that the entered time is the local time (legal time) of the defined observatory location. \\
+You need to **uncheck** the //Use system time// checkbox when you want to display a chart **for a date / time in the future or past**. You can set the date and time by usage of the appropriate combo boxes. SkyChart can calculate with dates in the range from -200'000 to +200'000 years. However, by default the planet positions are only properly calculated for dates from -3000 to +3000. You can expand this range by installing a [[solar_system#ephemeris|JPL ephemeris file]].\\
+Beware with the negative years: 1BC is the year 0 and 2BC is the year -1. Note that the entered time is the local time (legal time) of the defined observatory location. \\
 You also can set **[[http://en.wikipedia.org/wiki/Julian_day|JD time]]** by using the input area and the JD calendar dialog box. \\
 === fixed time buttons ===