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29.09.2015
The files can be easily modified and adapted to meet your specific requirements, then saved and used again at a later stage. All templates downloadable below are in US letter paper format (as used in the USA, Canada, Mexico, the Philippines and some South American countries). DISCLAIMER: While every effort has been made to ensure the accuracy of the data on this site, the owner cannot accept responsibility for any mistakes which may occur.
When he was first compiling his famous star catalogue in the year 129 BCE the Greek astronomer Hipparchus noticed that the positions of the stars did not match up with the Babylonian measurements that he was consulting.
Such a motion is called precession and consists of a cyclic wobbling in the orientation of Earth’s axis of rotation. The name arises from the fact that during a precession, the equinoxes could be seen moving westward along the ecliptic relative to the stars that were believed to be “fixed” in place – that is, motionless from the perspective of astronomers – and opposite to the motion of the Sun along the ecliptic.
This precession is often referred to as a Platonic Year in astrological circles because of Plato’s recorded remark in the dialogue of Timaeus that a perfect year could be defined as the return of the celestial bodies (planets) and the fixed stars to their original positions in the night sky. The cause of this was first discussed by Sir Isaac Newton in his Philosophiae Naturalis Principia Mathematica where he described it as a consequence of gravitation. It is now known that precessions are caused by the gravitational source of the Sun and Moon, in addition to the fact that the Earth is a spheroid and not a perfect sphere, meaning that when tilted, the Sun’s gravitational pull is stronger on the portion that is tilted towards it, thus creating a torque effect on the planet. Today, the term is still widely used, but generally in astrological circles and not within scientific contexts. Matt Williams is the Curator of the Guide to Space for Universe Today, a regular contributor to HeroX, a science fiction author, and a Taekwon-Do instructor.


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For templates in A4 paper format (the international standard paper size used in all other parts of the world) please see Calendarpedia's UK edition. Data is provided 'as is' without warranty and is subject to error and change without notice. According to these Chaldean records, the stars had shifted in a rather systematic way, which indicated to Hipparchus that it was not the stars themselves that had moved but the frame of reference – i.e. However, it was Hipparchus who is first credited with observing this phenomenon, according to Greek astronomer Ptolemy whose own work was in part attributed to him. First of all , the positions of the south and north celestial poles appear to move in circles against the backdrop of stars, completing one cycle every 25, 772 years.
Though his equations were not exact, they have since been revised by scientists and his original theory proven correct. The process is slow, but cumulative, and takes 25,772 years for a full precession to occur. If you find a mistake, or come across a problem of any kind (no matter how small), please do let us know. Please contact us for commercial use of our calendars, suggestions and ideas for improvement, mistakes found in the calendars and any other concerns.


Second, the position of the Earth in its orbit around the Sun during the solstices, equinoxes, or other seasonal times slowly changes. Get organized and plan ahead with these colorful, flexible multi-year calendars and planners! Infra Holding Limited: AIHL) a real estate company based in Noida coming up with commercial and residential real estate projects in Greater Noida and Noida.
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