Introduction to OM-MSS Software
by R C Chakraborty, July 09, 2015, Pages 1 – 5.
Earth, Sun, Moon & Satellites Motion in Orbit – Model & Simulation Software.
We look into space from Earth, which is 3rd planet from Sun. Earth takes around 365.25 days to moves around Sun in an Elliptical orbit. The average distance from the Earth to the Sun is called one Astronomical Unit (AU); 1 AU = 149,597,870.7 km. Mars is 4th planet from Sun, that takes 686.971 Earth days to orbit around Sun. The orbital path of Mars is highly eccentric. Mars & Earth move along their orbits, and come near to one another approximately every two years. This approach of coming near facilitate launching of spacecraft every two years, even that takes about eight months to reach Mars. Example : On Apr. 08, 2014, the near or close distance between Mars and Earth was 92.4 million km. Moon moves around Earth in the same kind of orbit. The Moon is the Earth’s only natural Satellite. The average distance of the Moon from the Earth is 384,403 km. A Satellite is an artificial object, intentionally placed into orbit. Thousands of Satellites are launched into orbit around Earth. A few Satellites called Space Probes have been placed into orbit around Moon, Mercury, Venus, Mars, Jupiter, Saturn, etc. Understanding the motion of Earth around Sun, and the motion of Moon and Satellites around Earth is of interest to many.
The OM-MSS is a software that simulates motion of Earth, Moon & Satellites in their respective Orbits with respect to Sun. The Software is written in ‘C’ Language. The Compiler used is Dev C++ and the Platform is a Windows 7, 64 bit Laptop. The Source Code around 30,000 Lines, is Compiled. The ‘OM-MSS.EXE’ File generated is of Size 1.5 KB. The Executable File, < OM-MSS.EXE >, is RUN Step-by-Step for a Set of Inputs. The execution of ‘Orbital Mechanics – Model & Simulation Software (OM-MSS)’, illustrates its Scope, Capability, Accuracy, and Usage. The OM-MSS Software is quite exhaustive for beginners, experts, researchers & professional in Spherical Astronomy. The source code of OM-MSS Software in full or in parts has a cost if there is buyer. The cost has not been evaluated / decided. The OM-MSS Software includes the following :
(a) Astronomical Time Standards and Time Conversions Utilities :
GMT – Greenwich Mean Time, LMT – Local Mean Time, LST – Local Sidereal Time, UT – Universal Time,
ET – Ephemeris Time, JD – Julian Day, Standard Epoch J2000, Gregorian Calendar date and more.
(b) Positional Astronomy of Earth, Sun, Moon, and Satellites Motion in Orbit, includes computations of :
* Position of Sun and Position of Earth on Celestial Sphere at Epoch ;
* Keplerian elements : Inclination, RA of asc. Node, Eccentricity, Arg. of Perigee, Mean Anomaly, Mean Motion;
* Motion Irregularities : Mean, Eccentric and True anomaly in deg;
* Precise Time at Earth Orbit Points : Perihelion, Aphelion, Equinoxes, Solstices, Semi-Major & Minor-axis;
* Astronomical years : Anomalistic, Tropical, and Sidereal Years;
* Four Seasons : Spring, Summer, Autumn and Winter start time and duration;
* Position of Satellites around Earth : Keplerian elements and State Vectors at epoch, and computing, Sub-Sat point lat / log, EL & AZ angles, Distances, Velocity, and more;
* Satellite Pass, Ground Trace for Earth Stn using NASA/NORAD 2-line bulletins;
(c) Customized Utilities and products : On special request either developed or configured and generated.
These are Presented in Section – 1 to 8. The Section – 9 contains References, and Section – 10 contains few related Diagrams.
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