Hindu Predictive Astrology Chapter 4: Planets, Signs and Constellations - A Modern Guide

This is one of the most important reference chapters in the entire book. Here Raman lays out the three building blocks of every Vedic horoscope: the nine planets (Navagrahas), the twelve zodiac signs (Rasis), and the twenty-seven lunar constellations (Nakshatras).

The relationship between these three elements is the foundation of all Vedic chart reading. You will refer back to the tables in this chapter constantly as you work through the rest of the book. Without a thorough understanding of how planets, signs, and constellations interrelate, it is impossible to accurately cast or interpret a Hindu horoscope.

Think of these three systems as three overlapping grids laid upon the same 360-degree sky. The signs divide the zodiac into twelve sectors of 30 degrees each. The nakshatras divide it into twenty-seven sectors of 13 degrees 20 minutes each. And the nine planets move through both grids simultaneously, their positions described in either system depending on the context. Mastering the conversion between these two coordinate systems is one of the first practical skills every student of Jyotish must develop.

Hindu astrology considers nine celestial bodies as the primary agents of cosmic influence on terrestrial life. The Sanskrit word Graha literally means "that which seizes or grasps," reflecting the ancient understanding that these celestial bodies seize and shape human destiny. Unlike Western astrology, which later added Uranus, Neptune, and Pluto, Vedic astrology has maintained the same nine-body system for thousands of years.

"Nine important planets are considered in Hindu astrology as affecting the terrestrial phenomena. Their Sanskrit equivalents and the symbols used by Western astrologers are also given here for ready reference."

Each planet has a primary Sanskrit name and one or more alternative names drawn from mythology, qualities, or astronomical characteristics. Here is the complete reference table:

A note on names: You will encounter multiple Sanskrit names for each planet in different texts. For example, Jupiter may be called Guru (teacher), Brihaspati (lord of prayer), or Devaguru (teacher of the gods). Familiarity with all common names will help you read classical texts more easily.

Understanding Rahu and Ketu

The last two entries in the table -- Rahu and Ketu -- deserve special attention because they are not physical bodies at all. They are the two points where the Moon's orbital plane intersects the ecliptic (the Sun's apparent path). These mathematical points are called the lunar nodes. Rahu is the ascending node (where the Moon crosses northward) and Ketu is the descending node (where it crosses southward).

Despite being invisible, Rahu and Ketu are given full planetary status in Hindu astrology. They move in retrograde motion (backward through the zodiac) and complete one full cycle in approximately 18 years and 7 months. Their positions are critical for calculating eclipses, and they play a dominant role in the Dasa (planetary period) system, particularly the Vimshottari Dasa scheme that assigns 18 years to Rahu and 7 years to Ketu.

The mythological names "Dragon's Head" and "Dragon's Tail" come from the ancient story of the serpent demon Svarbhanu, who was cut in two by Vishnu's discus after drinking the nectar of immortality. The head became Rahu and the tail became Ketu, and they forever chase the Sun and Moon across the sky, occasionally "swallowing" them to cause eclipses.

The Seven Visible Planets and the Days of the Week

The seven visible planets (Sun through Saturn) each rule one day of the week. This correspondence is identical in both Hindu and Western traditions, and it is one of the strongest pieces of evidence for an ancient shared astronomical heritage:

Notice how the English names preserve the same planetary rulers: Sunday (Sun), Monday (Moon), Saturday (Saturn). The connection is even clearer in Romance languages: in French, Mardi (Mars), Mercredi (Mercury), Jeudi (Jupiter = Jove), Vendredi (Venus). This universal weekday-planet correspondence goes back at least to Babylonian times and was adopted independently by both Indian and Greco-Roman civilizations.

The 360-degree zodiac is divided into twelve equal signs of 30 degrees each. The Sanskrit word Rasi literally means "a heap" or "a group," referring to the cluster of stars that forms each sign. Raman provides the Sanskrit names, English equivalents, and symbolic representations:

"The twelve signs of the zodiac are: Mesha -- Aries -- the Ram; Vrishabha -- Taurus -- the Bull; Mithuna -- Gemini -- the Twins; Kataka -- Cancer -- the Crab; Simha -- Leo -- the Lion; Kanya -- Virgo -- the Virgin; Thula -- Libra -- the Balance; Vrischika -- Scorpio -- the Scorpion; Dhanus -- Sagittarius -- the Centaur; Makara -- Capricorn -- the Crocodile; Kumbha -- Aquarius -- the Water-bearer; Meena -- Pisces -- the Fishes."

Note on Makara: In Western astrology, Capricorn is symbolised by the goat. In Hindu astrology, the symbol is a crocodile (Makara), which is a mythical sea-creature often depicted as half-deer, half-fish. This is one of many small but telling differences between the two traditions. The Makara appears frequently in Indian temple architecture and is the vehicle (vahana) of Varuna, the god of the oceans.

Odd and Even Signs

The twelve signs alternate between odd (1, 3, 5, 7, 9, 11) and even (2, 4, 6, 8, 10, 12). Odd signs are considered masculine, active, and cruel in temperament. Even signs are considered feminine, passive, and mild. This alternation creates a rhythmic pattern through the zodiac that influences interpretation: a planet in an odd sign expresses itself more aggressively, while the same planet in an even sign expresses itself more gently.

Elemental Classification

The signs are also grouped by element, a classification system shared with Western astrology but using Sanskrit terminology:

Fire signs produce dynamic, energetic personalities. Earth signs yield practical, grounded individuals. Air signs foster intellectual, communicative temperaments. Water signs create emotional, intuitive natures. Raman explores these classifications in greater depth in the next chapter on the peculiarities of the zodiacal signs.

The nakshatra system is one of the most distinctive features of Hindu astrology and has no direct parallel in Western astrology. The zodiac is divided into 27 nakshatras, each spanning 13 degrees and 20 minutes of arc. Each nakshatra is further divided into 4 quarters (padas) of 3 degrees and 20 minutes each. This gives a total of 108 padas across the entire zodiac -- a number considered sacred in Hinduism and frequently encountered in spiritual practice (108 beads on a mala, 108 Upanishads, and so on).

"The zodiac is marked by 27 constellations or nakshatras. The first point of the Aswini, the first constellation, synchronises with the first point of Aries, which is the starting point of the fixed zodiac. Each nakshatra measures 13 degrees 20 minutes of arc and consists of four quarters or padas of 3 degrees 20 minutes each."

Each nakshatra is identified with a specific star or star-group in the actual sky, and Raman provides the astronomical identification alongside a description of the visual pattern formed by the stars. These visual resemblances were used by ancient sky-watchers to locate the nakshatras before telescopes existed.

Why Nakshatras Matter in Practice

The Moon's nakshatra at birth determines your Dasa (planetary period) sequence, which is one of the most powerful predictive tools in Vedic astrology. Your birth nakshatra also determines compatibility in marriage matching (Nakshatra Porutham or Ashta Kuta matching).

In daily life, nakshatras are used to select auspicious times (Muhurta) for important activities. Certain nakshatras are considered favorable for travel, others for starting new ventures, and still others for ceremonies. The Panchanga (Hindu almanac) lists the ruling nakshatra for each day, and traditional Hindus consult this information before making important decisions.

The nakshatra system also provides a finer level of personality analysis than the sign system. Two people may both have the Moon in Taurus, but if one has the Moon in Krittika nakshatra and the other in Rohini nakshatra, their emotional temperaments will differ significantly. Krittika is ruled by the Sun and carries fiery, purifying energy, while Rohini is ruled by the Moon and carries nurturing, creative energy.

Paired Nakshatras

An interesting feature noted in the original text is that several nakshatras come in pairs that share the same visual form. Pubba and Uttara (both resembling "legs of a cot") are paired, as are Poorvashadha and Uttarashadha, and Poorvabhadra and Uttarabhadra. The prefixes Poorva (former/east) and Uttara (latter/north) indicate the relative positions of these paired constellations. This pairing reflects the continuous nature of the stellar landscape, where one constellation flows naturally into the next.

Since each sign spans 30 degrees and each nakshatra spans 13 degrees 20 minutes, exactly 2 and 1/4 nakshatras (or 9 padas) fit into each sign. This creates the critical mapping table that allows you to convert between nakshatra positions and sign positions. Understanding this mapping is not merely academic -- it is an essential practical skill because traditional Hindu almanacs overwhelmingly report planetary positions using the nakshatra system rather than the sign-degree system familiar to Western astrologers.

"Thus 2 and 1/4 constellations or nine quarters comprise a zodiacal sign. The Rasis (signs) and Nakshatras (constellations) are both reckoned from the same point, viz., the zero degree of the zodiac or the first point of Mesha (Aries)."

"The above table interpreted means that four quarters of Aswini, four quarters of Bharani and the first quarter of Krittika make up Aries or Mesha. The remaining three quarters of Krittika, four quarters of Rohini and the first two quarters of Mrigasira compose Taurus or Vrishabha and so on."

"This will enable one to fix the positions of planets in a horoscope, as in most Hindu almanacs, the planetary positions are generally given in constellations and quarters."

Worked Example: Converting Nakshatra Position to Sign

Suppose your Panchanga (almanac) says the Moon is in Rohini, 3rd pada. How do you find the sign?

1. Look at the mapping table: Rohini falls entirely within Taurus (all 4 padas are in Taurus).
2. Therefore the Moon is in Taurus (Vrishabha).
3. To find the exact degree: Rohini starts at 40 degrees (after Krittika padas 2-4 which span 30-40 degrees). Each pada is 3 degrees 20 minutes. The 3rd pada begins at 40 + (2 x 3 deg 20 min) = 46 degrees 40 minutes and ends at 50 degrees.
4. So the Moon is between 46 degrees 40 minutes and 50 degrees of the zodiac, which is 16 degrees 40 minutes to 20 degrees of Taurus.

Now consider a trickier case: Krittika, 2nd pada. Krittika spans two signs -- its 1st pada is in Aries, and padas 2-4 are in Taurus. So the 2nd pada of Krittika places the planet at 30 degrees to 33 degrees 20 minutes, which is 0 to 3 degrees 20 minutes of Taurus. These "boundary nakshatras" -- the ones that straddle two signs -- are the ones where careful attention to pada is essential.

A circle has no natural beginning or end. So how do we measure positions on the zodiac? Raman explains that an astronomical reference point is established at the end of the constellation Revati (the last nakshatra). This point is called the first point of Aries -- the zero degree of the zodiac.

"The zodiac is a circle of light and consequently it knows no beginning or end. In order to measure the distance an astronomical point (end of the constellation of Revati) is established which is called the first point of Aries."

This is the fixed (Nirayana) zodiac used in Hindu astrology, as opposed to the moving (Sayana) zodiac used in Western astrology. The difference between the two starting points is called the Ayanamsa, and it increases by about 50 seconds of arc per year due to the precession of the equinoxes.

As of 2026, the Ayanamsa is approximately 24 degrees (varying slightly depending on which Ayanamsa value one uses -- Lahiri, Raman, Krishnamurti, and others differ by small amounts). This means that if Western astrology says your Sun is at 10 degrees Taurus, Hindu astrology would place it at roughly 16 degrees Aries. This is why many people find their Vedic Sun sign is different from their Western Sun sign -- it is not that one system is "wrong," but rather that they use different coordinate systems anchored to different reference points.

Raman notes that this distinction will be explored further in Chapter IX on Western horoscope casting, where the practical implications of the Ayanamsa for chart conversion are discussed in detail.

Now that we have examined each of the three systems individually -- planets, signs, and constellations -- it is worth stepping back to see how they function as a unified whole. A planet's position in a Vedic horoscope is always described in terms of both the sign it occupies and the nakshatra (and pada) it occupies. These two descriptions carry different types of information and are used for different predictive purposes.

The sign (Rasi) position tells you:

• Which house the planet occupies in the chart (relative to the Ascendant sign)
• The planetary ruler of that sign (the "dispositor")
• The element and modality of the sign (fire/earth/air/water; movable/fixed/common)
• Aspects and conjunctions with other planets

The nakshatra position tells you:

• The nakshatra lord, which determines the Dasa sequence
• The sub-lord (pada ruler) for finer timing in predictive techniques
• The star-based compatibility factors used in marriage matching
• Specific qualities and mythology associated with that star

A complete planetary description might read: "Moon in Taurus, Rohini nakshatra, 3rd pada." This single statement tells an experienced astrologer the Moon's sign lord (Venus, who rules Taurus), nakshatra lord (Moon itself, who rules Rohini), sub-lord, and approximate degree -- all from one compact notation.

The Mathematics of Division

The relationship between signs and nakshatras produces elegant mathematical patterns. Consider:

Notice that the padas and the Navamsa divisions are identical: both divide the zodiac into 108 equal parts of 3 degrees 20 minutes each. This is not a coincidence. The Navamsa chart (D-9), which is the most important divisional chart in Vedic astrology, is directly derived from the pada system. Each pada corresponds to one Navamsa, and the sign of the Navamsa is determined by counting from the sign of the nakshatra according to specific rules. This deep structural connection between nakshatras and divisional charts is one of the mathematical beauties of the Vedic system.

For the modern student of Vedic astrology, this chapter serves as a reference that you will return to again and again. Here are some practical suggestions for internalizing its contents:

Memorize the nakshatra sequence. The 27 nakshatras in order -- Aswini, Bharani, Krittika, Rohini, Mrigasira, Aridra, Punarvasu, Pushyami, Aslesha, Makha, Pubba, Uttara, Hasta, Chitta, Swati, Visakha, Anuradha, Jyeshta, Moola, Poorvashadha, Uttarashadha, Sravana, Dhanishta, Satabhisha, Poorvabhadra, Uttarabhadra, Revati -- form the backbone of Vedic astrology. Many students find it helpful to learn them in groups of nine (one for each set of three signs).

Learn the boundary nakshatras. Nine nakshatras straddle two signs: Krittika (Aries/Taurus), Mrigasira (Taurus/Gemini), Punarvasu (Gemini/Cancer), Uttara (Leo/Virgo), Chitta (Virgo/Libra), Visakha (Libra/Scorpio), Uttarashadha (Sagittarius/Capricorn), Dhanishta (Capricorn/Aquarius), and Poorvabhadra (Aquarius/Pisces). For these nakshatras, knowing the pada is essential to determine the correct sign.

Practice conversion. Take any Panchanga and practice converting the daily nakshatra-pada positions of planets into sign-degree positions and vice versa. With practice, these conversions become automatic, and you will be able to glance at a traditional almanac and immediately visualize the planetary positions in a Rasi chart.

"In order to measure the distance an astronomical point (end of the constellation of Revati) is established which is called the first point of Aries."

This seemingly simple statement about the starting point of measurement has profound implications. It means that the entire Vedic system is anchored to the fixed stars, not to the seasons. The stars are the ultimate reference frame, and the nakshatras are the bridge between the abstract geometry of the zodiacal signs and the observable reality of the night sky.