Kipp&Zonen SOLYS 2 Sun Tracker - Manual (Page 57)

9 SOFTWARE OVERVIEW
The software used in the SOLYS 2 contains open source components that are listed in the table below.
This software is available from our website:
www.kippzonen.com/suntrackers/SOLYS2/software/download
The software and versions listed below were used during the production of this manual. Look on the website
for the last revision of this list.
Software Version License
Apache httpd-2.2.8 Apache License 2.0
Avahi avahi-0.6.17 LGPL 2.1
BusyBox busybox-1.1.3 GPL 2
Expat XML parser expat-2.0.0 EXPAT License
GNU C Library glibc-2.3.3 LGPL 2.1 / Licenses for non-FSF code in
GLIBC
GNU Project Debugger gdb-6.5 GPL 2
GPS Daemon gpsd-4093 (pre 2.34
+ patches) GPSD License
Grand Unified Bootloader grub-0.97-33 GPL 2
Ifplugd ifplugd-0.28 GPL 2
Libdaemon libdaemon-0.10 LGPL 2.1
Linux Kernel linux-2.4.31 GPL 2
LinuxThreads Library glibc-linuxthreads-
2.3.3 LGPL 2
Ncurses Library ncurses-5.5 NCURSES License
Network Time Protocol
Daemon ntp-4.2.2p3-RC NTP License
OpenSSL (for
configuration data
integrity only) openssl-0.9.8c OpenSSL License / SSLeay License
PHP php-5.2.5 PHP 3.01 License
RT-Linux rtlinux-3.1 OPEN RTLINUX PATENT LICENSE / GPL 2
SOLYS2 Suntracking
Tools V1R1 Kipp & Zonen SOLYS License
uClibc uClibc-0.9.28.3 LGPL 2
Vortex86 watchdog driver vx86wdt GPL 2
Watchdog Daemon watchdog-5.4 GPL 1
Table 7.1
9.1 ALGORITHM
The algorithm the SOLYS 2 is using is a free to use algorithm developed by J.J. Michalsky. (Working for
N.O.A.A.)
One of the inputs for this algorithm is time!
Six out of ten years the time needs to be corrected due to the earth slowing down. This is what we call the
“leap second”
The SOLYS 2 has a built in GPS receiver that constantly synchronizes the internal clock with the satellite clock
(compensating for drift in the RTC (real time clock) as for the equation of time, the correction is also applied
into this algorithm.