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Jyotish is considered to be one of the Vedangas (part of Vedas) propounded by lord Brahma by the scientific study of which human beings can accomplish virtue. Jyotish shastra or the science of Vedic astrology, is a compilation of 4,00,000 verses (vide Narada Purana, II.50.2). Vedic astrology has mainly three branches – Siddhanta (the principle), Jataka or Hora (astrology for individuals) and Samhita (astrology for masses). • Siddhanta, also known as Ganita, deals with the mathematical calculations, the methodology of calculating planetary positions, knowledge about time, place, direction, lunar and solar eclipses, their rising and setting, planetary movements, conjunctions, retrogression, etc. • Jataka (Hora) deals with the techniques of interpretation of horoscopes of individuals. It describes signs, planets, their qualities, family situations/ circumstances at the time of birth, arishta (mishaps), longevity of the native, different dasha systems and their results, profession (sources of livelihood), ashtakavarga, varied types of yogas, results of planetary positions in different houses, signs, nakshatras, aspects of planets, planetary combinations, female horoscopy, circumstances at the time of death, cases of unknown birth time, etc. The term „Hora‟ has been applied to „Jataka‟ or natal astrology, as well as to the „Muhurta‟ or electional astrology (i.e., selecting the appropriate moment to commence an undertaking). • Samhita is that branch of astrology which is related to masses and is a compilation of varied subjects like the results of rising and setting of planets, appearance of different types of comets, varied types of chakras, predicting about rainfalls, earthquakes, natural disasters and epidemics, results of planetary movements on kingdoms, nations, masses and commodities, etc. The Geocentric System It is a human tendency to refer to other things in relation to oneself. Sitting in a moving train, we see things passing by the train – trees, farms, hutments, etc. A common question arises in our mind – which is the station coming next? At the back of our mind we do know that it is not the station which is going to come, it is the train which will reach the next station. Similarly we refer to the rising and setting of the Sun. But we do know that it is not the Sun which is rising or setting, it is the spin of the earth which makes it appear so. Because we feel stationary on the solid earth, the sky seems to spin around us in complicated ways. In our quest to understand what we see, our ancients had evolved a most innovative and powerful tool. As nothing is stationary in the universe, whether it is a satellite or a planet or even a star, it is convenient to imagine our position in the universe – the earth – as its centre and the whole of the universe moving around us in constant motion. Thus considering the relative positions and movements of all heavenly bodies with respect to the earth is the Geo-centric system. On the other hand, when we consider the relative position of planets (including the earth) in respect of the Sun, it forms the basis of the Helio-centric system. Vedic astronomy and astrology are essentially geo-centric in their concept. The Earth

The earth is spherical and rotates from west to east around its axis. The axis of the earth is an imaginary line which, passing through its centre, connects its two poles, the north pole and the south pole. Another imaginary line running across the largest circumference of the earth, equidistant from its poles and running in an east-west direction, is called the equator. The Celestial Sphere Think of the sky as a great, hollow, crystalline sphere surrounding the earth. Imagine the stars to be attached to the inside of the sphere like thumbnails stuck in the ceiling. The sphere takes one day to rotate, carrying the Sun, the Moon, the planets and the stars from east to west. We know that the sky is not a great, hollow, crystalline sphere. The stars are scattered through space at different distances, and it isn‟t the sky that rotates once a day. It is rather the earth that rotates once in a day around its axis. It is convenient as a model of the sky. This model of the sky, the Celestial sphere, is an imaginary hollow sphere of very large radius (infinity) surrounding the earth and to which the stars seem to be attached. On this imaginary sphere the celestial equator, the celestial poles, and other reference points are marked as they are done on the earth; these represent the extensions of the equator and the poles, etc., of the earth into infinity.

Zodiac The earth takes one year to complete its rotation around the Sun. From the earth, it appears that the Sun moves around the earth. This apparent path of the Sun is known as ecliptic. An imaginary belt of 18 degrees width with ecliptic in its centre is known as the zodiac. Many groups of stars appear to have been studded on this imaginary belt. Vedic astrology recognizes 27 such groups of stars called nakshatras. The zodiac encircles the earth like a circle consisting of 360 degrees. If this circle is divided into 27 equal parts, each part will be of 13 degrees and 20 minutes arc, known as a nakshatra. Each nakshatra is further divided into 4 quarters (padas or charanas), of 3 degrees and 20 minutes arc each. Twelve divisions of the zodiac will have an arc of 30 degrees each, known as rashis (or signs).

The above figure shows rising of the Sun in the eastern horizon. The line passing through the centre of the Sun is the ecliptic, the apparent path of the Sun created by its „revolution‟ around the earth during its annual journey. The group of stars, referred to as the nakshatras, are the fixed reference points in the zodiac used to locate the position of the Sun, the Moon and other heavenly bodies. All the planets considered in Vedic astrology for the purpose of interpretation, do not decline beyond the belt of the zodiac. They may be on the ecliptic or towards the north or sourth of the ecliptic depending on their latitude with reference to the ecliptic. For example, the orbit of the Moon is inclined at an angle of 5 degrees to the ecliptic. The Moon does not go beyond 5 degrees on either side of the ecliptic. The orbit of the Moon cuts the ecliptic at two point. In its orbit, when the Moon is on the ecliptic while moving from south of ecliptic to north, this point is known as Rahu or the ascending node of the Moon and when the Moon is on the ecliptic while moving from north of ecliptic to south of ecliptic, this point of intersection is known as Ketu or the descending node of the Moon. The point of sunrise with respect to the observer keeps changing during the year. If A is the point of sunrise when the Sun is at vernal equinox (around March 21 every year), the point of sunrise

will appear to move northwards till it reaches the summer solstice (B) on or around June 21. from this point it will start its southernly journey (Dakshinayana) during which it reaches the autumnal equinox (again A) around September 23 and further until it reaches winter solstice (C) around December 22. At this stage it starts its northward journey (Uttarayana). Tropical Zodiac The most crucial point in the division of a circle is to know the starting point of the circle. The point where the ecliptic cuts the celestial equator is known as equinox. There are two such equinoxes – the vernal equinox and the autumnal equinox. When the Sun is passing from the southern hemisphere to the northern hemisphere, it cuts the equator at vernal equinox. When the division of the circle of the zodiac is with reference to vernal equinox as its starting point, the zodiac is referred to as the Sayana (or tropical) zodiac, the divisions of this zodiac into twelve equal parts are the Sayana rashis, and the positions of planets in this zodiac represent the Sayana longitudes of the planets. The Precession of Equinoxes If we could watch the sky for a few hundred years, we would discover that the north celestial pole is moving slowly with respect to Dhruva (Polaris) star. The celestial poles and the celestial equator, supposed to be the fixed reference marks, are moving very slowly because of the slow change in the direction of Earth‟s axis of rotation. This slow top-like motion is called precession. Earth‟s axis sweeps around in a cone, taking almost 26,000 years for each sweep. Precession is caused by the gravitational pull of the Sun and the Moon. Because earth is not a perfect sphere – it has a slight bulge around its equator – Sun and Moon pull on it, trying to make it spin upright in its orbit. This forces earth‟s axis to precess. The result of this precession is that vernal equinox, the cutting point of the ecliptic and the celestial equator, drifts westward on the ecliptic by an approximate angle of 51 seconds of an arc each year. So we have a new vernal equinox every year and hence a new staring point of the Sayana zodiac. This results in the shifting of the Sayana signs.

Sidereal Zodiac The Vedic system does not depend on this shifting zodiac and relies on a fixed point on the zodiac as its starting point. There is no clear cut demarcation of this starting point in the zodiac. Some consider this point to be 180 degrees opposite to the Chitra nakshatra. Some consider it to be slightly to the east of the Revati nakshatra, while still others opine differently. When the division of the circle of the zodiac is with reference to the Vedic starting point, the zodiac is referred to as the Nirayana (or Sidereal) zodiac, the twelve equal parts are the Nirayana rashis, and the positions of planets in this zodiac represent the Nirayana longitudes of the planets.

The angular difference between the vernal equinox and the Vedic starting point of the zodiac is known as the Ayanamsha. When the Vedic starting point is with reference to Chitra nakshatra, the Ayanamsha is refered to as the Chitrapaksha Ayanamsha. According to this system the first point of Sayana zodiac and Nirayana zodiac coincided in the year 285 A.D. The corresponding value of this Ayanamsha on January 1997 is 23°48'56".

Grahas (planets) :

The words “planet” and “star” are used in a slightly different sense in astrology than in astronomy. For example, Sun (a star) and Moon (a satellite of earth) are called planets in astrology, along with Mars etc. Basically, a graha or a planet is a body that has considerable influence on the living beings on earth. Distant stars have negligible influence on us, but Sun, Moon and planets in the solar system have a great influence on our activities. So the word graha (or planet) is used to describe them. Seven planets are considered in Indian astrology. They are – Sun, Moon, Mars, Mercury, Jupiter, Venus and Saturn. In addition, two “chaayaa grahas” (shadow planets) are considered in Indian astrology – Rahu and Ketu. These are also called “the north node” and “the south node” respectively (or the head and tail of dragon). Rahu and Ketu are not real planets; they are just some mathematical points. Apart from these 9 planets, there are 11 moving mathematical points known as Upagrahas (sub-planets or satellites). We also have lagna (ascendant), which is the point that rises on the eastern horizon as the earth rotates around itself. In addition, we have some mathematical points known as “special ascendants". Sanskrit Name

English Name

Abbreviation Gender Guna

Surya ()

Sun

Sy or Su

M

Sattva

Chandra ()

Moon

Ch or Mo

F

Sattva

Mangala ()

Mars

Ma

M

Tamas

Budha ()

Mercury

Bu or Me

N

Rajas

Brihaspati ()

Jupiter

Gu or Ju

M

Sattva

Shukra ()

Venus

Sk or Ve

F

Rajas

Shani ()

Saturn

Sa

M

Tamas

Rahu ( )

North Lunar Node Ra

M

Tamas

Ketu ( )

South Lunar Node Ke

M

Tamas

Planets in maximum exaltation, mooltrikona (own sign), and debilitation, are:[12] Graha

Exaltation

Mooltrikona

Debilitation Sign Rulership

Sun

10° Aries

4°-20° Leo

10° Libra

Leo

Moon

3° Taurus

4°-20° Cancer

3° Scorpio

Cancer

Mars

28° Capricorn 0°-12° Aries

28° Cancer

Aries, Scorpio

15° Pisces

Gemini, Virgo

Mercury 15° Virgo

16°-20° Virgo

Jupiter

0°-10° Sagittarius 5° Capricorn Sagittarius, Pisces

5° Cancer

Venus

27° Pisces

0°-15° Libra

27° Virgo

Taurus, Libra

Saturn

20° Libra

0°-20° Aquarius

20° Aries

Capricorn, Aquarius

Rahu and Ketu are exalted in Taurus/Scorpio and are also exalted in Gemini and Virgo. The natural planetary relationships are:[13] Graha

Friends

Neutral

Enemies

Sun

Moon, Mars, Jupiter

Mercury

Venus, Saturn

Moon

Sun, Mercury

Mars, Jupiter, Venus, Saturn Mercury, Venus, Saturn

Mars

Sun, Moon, Jupiter

Venus, Saturn

Mercury

Mercury

Sun, Venus

Mars, Jupiter, Saturn

Moon

Jupiter

Sun, Moon, Mars

Saturn

Mercury, Venus

Venus

Mercury, Saturn

Mars, Jupiter

Sun, Moon

Saturn

Venus, Mercury

Jupiter

Sun, Moon, Mars

Rahu, Ketu Mercury, Venus, Saturn Mars

Sun, Moon, Jupiter

Zodiac Imagine a belt or a path in the sky, some 18 degrees of are in

width, running around the earth in an east-west direction. Groups of stars, to all appearance fixed, are studded along this imaginary belt. Twenty seven (or twenty eightl) such groups of stars are in Vedic astrology. Because of lack of apparent motion, these are called as Nakshatras. This imaginary belt, with nakshatras studded on it, is called the zodiac. The zodiac forms the reference point for fixing up the position of any planet or star in the sky. Since it encircles the earth, it is comprised of 360 degrees. The twenty-seven nakshatras being evenly placed on it each have a span of 13°2O' arc. The various nakshatras are numbered from one to twenty-seven. In contrast to the fixed nakshatras, there are the moving heavenly bodies called the Grahas. These move along the zodiac from the west to the east. They derive their name from the fact that, while moving against the background of the nakshatras, they appear to get hold of one nakshatra after the other (graha = to catch hold 00. Vedic astrology recognises nine grahas. They are the Sun, the Moon, Mars, Mercury, Jupiter, Venus, Saturn, Rahu and Ketu. Of these, the Sun is a star, the Moon is a satellite of the earth, Rahu and Ketu are mere mathematical points on the zodiac, while the remaining ones are planets.

Rasis (zodiac signs) :

The positions of all these planets, upagrahas, lagna and special lagnas in the zodiac are measured in degrees, minutes and seconds from the start of the zodiac (which is a fixed point in the sky). These positions are measured as seen from earth and they are called “geocentric positions". These positions are measured in longitude and sphuta. When watched from earth, the longitude of any planet in the skies can be from 0°0'0'' (0 degrees 0 minutes 0 seconds) to 359°59'59''. It should be noted that 0°0'0'' corresponds to the beginning of the zodiac. Sidereal zodiac is also an imaginary belt of 360 degrees (as viewed from earth), divided into 12 equal parts. Each twelfth part (of 30 degrees) is called sign or rashi. The zodiac (sky) lasts 360° as mentioned above and it is divided into 12 equal parts. They are called “rasis” (signs). English names, Sanskrit names, two-letter symbols and values of the start longitude and the end longitude (in degrees, minutes and seconds) of all twelve rasis are given in below table. Rasi name

Sanskrit Name

Symbol Start

End

Aries Mesha Taurus Vrishabha/ Gemini Mithuna Cancer Karkataka/ Leo Simha Virgo Kanya Libra Thula Scorpio Vrischika SagittariusDhanus Capricorn Makara Aquarius Kumbha Pisces Meena

Number Sanskrit Name

Ar Ta Ge Cn Le Vi Li Sc Sg Cp Aq Pi

0°0'0'' 29°59'59'' 30°0'0'' 59°59'59'' 60°0'0'' 89°59'59'' 90°0'0'' 119°59'59'' 120°0'0'' 149°59'59'' 150°0'0'' 179°59'59'' 180°0'0'' 209°59'59'' 210°0'0'' 239°59'59'' 240°0'0'' 269°59'59'' 270°0'0'' 299°59'59'' 300°0'0'' 329°59'59'' 330°0'0'' 359°59'59''

Western/Greek Name

Tattva (Element)

Quality

Ruling Planet

1

Meṣa () "ram"

Aries (Κπιόρ "ram")

Tejas (Fire)

Cara (Movable) Mars

2

Vṛṣabha ( ) "bull"

Taurus (Ταῦπορ "bull")

Prithivi (Earth)

Sthira (Fixed)

Venus

3

Mithuna ()

Gemini (Δίδςμοι "twins")

Vayu (Air)

Dvisvabhava (Dual)

Mercury

"twins"

4

Karkaṭa ( ) "crab"

Cancer (Καπκίνορ "crab")

Jala (Water)

Cara (Movable) Moon

5

Siṃha ( ) "lion"

Leo (Λέων "lion")

Tejas (Fire)

Sthira (Fixed)

Sun

6

Kanyā () "girl"

Virgo (Παπθένορ "virgin")

Prithivi (Earth)

Dvisvabhava (Dual)

Mercury

7

Tulā () "balance"

Libra (Ζςγόρ "balance")

Vayu (Air)

Cara (Movable) Venus

8

Vṛścika () "scorpion"

Scorpio (Σκoππιόρ "scorpion")

Jala (Water)

Sthira (Fixed)

Mars

9

Dhanus () "bow"

Sagittarius (Τοξότηρ "archer")

Tejas (Fire)

Dvisvabhava (Dual)

Jupiter

10

Makara () monster"

Capricorn (Αἰγόκεπωρ "goathorned")

Prithivi (Earth)

Cara (Movable) Saturn

"pitcher"

Aquarius (Ὑδποσόορ "waterpourer")

Vayu (Air)

Sthira (Fixed)

Saturn

Mīna () "fish"

Pisces (Ἰσθεῖρ "fish")

Jala (Water)

Dvisvabhava (Dual)

Jupiter

11

12

"sea-

Kumbha ( )

Rashi Notation If a planet is at 221°37', then you can find from above table that it is between 210°0'0'' and 239°59'59''. So, that planet is in Scorpio (or Vrischika). Its advancement from the start of the rasi occupied by is 11°37'. Its position in the zodiac (221°37') is shown by some people by the notation 11°37' in Sc or simply 11 Sc 37. This means “advanced by 11°37' from the start of Sc (Scorpio)".

The whole zodiac is nothing but a manifestation of Lord Vishnu’s body. Aries is the head. Taurus is the face. Gemini is the arms. Cancer is the heart. Leo is the stomach. Virgo is the hip. Libra is the space below navel. Scorpio is the private parts. Sagittarius is the thighs. Capricorn is the knees. Aquarius is the ankles. Pisces is the feet. These are the limbs that rasis in the natural zodiac stand for. Because we are all part of the Supreme energy governing this world, the above mapping applies t...