summaryrefslogtreecommitdiff
path: root/time/gm_sidereal.c
diff options
context:
space:
mode:
Diffstat (limited to 'time/gm_sidereal.c')
-rw-r--r--time/gm_sidereal.c60
1 files changed, 0 insertions, 60 deletions
diff --git a/time/gm_sidereal.c b/time/gm_sidereal.c
deleted file mode 100644
index b0984aa..0000000
--- a/time/gm_sidereal.c
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * (C)2012 Michael Duane Rice All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- * Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following disclaimer. Redistributions in binary
- * form must reproduce the above copyright notice, this list of conditions
- * and the following disclaimer in the documentation and/or other materials
- * provided with the distribution. Neither the name of the copyright holders
- * nor the names of contributors may be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-/* $Id: gm_sidereal.c 2369 2013-04-28 14:19:35Z swfltek $ */
-
-/*
- Greenwich Mean Sidereal Time. A sidereal second is somewhat shorter than a standard second,
- about 1.002737909350795 sidereal seconds per standard second.
-
- We resort to fixed point math due to the insufficient resolution of a 'double', using...
-
- timestamp * ( 1.002737909350795 << 31 )
- --------------------------------------- + Te
- 1 << 31
-
- Where Te is the sidereal time at the epoch.
-
-*/
-
-#include <time.h>
-#include <stdint.h>
-
-unsigned long
-gm_sidereal(const time_t * timer)
-{
- uint64_t tmp;
-
- tmp = *timer;
- tmp *= 0x8059B740;
- tmp /= 0x80000000;
- tmp += (uint64_t) 23991;
-
- tmp %= ONE_DAY;
- return tmp;
-}