RAHU AND KETU

Rahu and Ketu are the nodes of the Moon. When l lie Moon crosses the ecliptic while going from south to north of the ecliptic, it is the ascending node of  the  Moon which is called Rahu. The latitude of the Moon at Rahu is zero and is on the…

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NODES

Nodes are the points at which the orbit of the Moon, or any planet cuts the plane of ecliptic. During the course of its movement (i.e. of the Moon or the respective planet) when the said heavenly body crosses the ecliptic plane, the crossing points are called nodes of the…

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Phases of Moon

The Moon has no light of its own but it reflects the light received from the Sun. It revolves round the Earth and its path is inclined at an angle of 5° approximately to the ecliptic. So, the eclipse cannot take place on every amavasya and purnima. (It will be…

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DIVISION

Zodiac has been divided into twelve rashis each  of  30° and their Indian names have been given   according to the shape of the stars in it. 1) Aries = Mesha              (7) Libra = Tula 2) Taurus = Vrisha          (8) Scorpio…

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MOVABLE AND FIXED ZODIACS

Zodiac is an imaginary belt of about 9° North or  South  of the ecliptic within which the Moon and all the planets (except Pluto) remain in the course of  their  movement. The fixed zodiac is one in which the first point of  Aries is always fixed in the nakshatras i.e….

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NUTATION

The effect of Sun’s and Moon’s attraction is not constant. Moon is sometimes above and sometimes below the ecliptic and therefore its pull on the equatorial bulge of the Earth is not always in the same direction as that of the Sun which results in the nodding of the celestial…

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Precession of Equinoxes

By continuous observation our rishis found out that the   longitudes of stars are increasing. Later on, the same phenomenon was noticed by the Greek astronomer Hipparchus (190-120 BC). They  considered two possible explanations for this: (1) The stars  are moving but the movements of all the stars  were mostly…

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WHY THE PLANETS BECOME RETROGRADE

First of all we take up the case of an inner planet. Let it be Mercury. The Sun is in the centre around which all the planets, including the Earth, are moving. Mercury is nearer to the Sun and it completes one revolution in 88 days. The Earth is away…

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Kepler’s Laws

The laws according to which the planets move around the Sun were discovered by John Kepler (1571-1630) which are given below. 1    Each planet moves in an elliptic orbit with the Sun in one of the foci. 2    Equal areas are covered in equal times by the radius…

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Meteorites

Meteorites: These are relatively larger bodies, big rocks etc., which do not get completely burnt up in atmosphere before reaching the Earth’s surface, and which produce craters etc. or get buried deep.

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