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-rw-r--r--info/blueshift.texinfo11
1 files changed, 11 insertions, 0 deletions
diff --git a/info/blueshift.texinfo b/info/blueshift.texinfo
index 4b3dce1..89c7bde 100644
--- a/info/blueshift.texinfo
+++ b/info/blueshift.texinfo
@@ -1509,6 +1509,17 @@ The Sun's lowest and highest elevation during
astronomical twilight, measured in degrees.
@end table
+Blueshift provides a constant for the apparent
+size of the Sun: @code{SOLAR_APPARENT_RADIUS}.
+This constant can for example be used to get a
+more accurate time when the night begins: rather
+than simply saying that the night begins when
+the Sun's apparent elevation is zero, you can say
+that it begins when the Sun is no longer visible
+at all, which is when the Sun's apparent elevation
+is minus @code{SOLAR_APPARENT_RADIUS}. This value
+is approximate.
+
@node Weather
@section Weather