From 1226a9e90044ac1f65b2651ca84fd2c631a25134 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Sat, 26 Jul 2014 11:54:20 +0200 Subject: doc SOLAR_APPARENT_RADIUS MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- info/blueshift.texinfo | 11 +++++++++++ 1 file changed, 11 insertions(+) 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 -- cgit v1.2.3-70-g09d2