Fast and Slow Planets in Transit
Lesson 2 of AstroWord's free Vedic astrology course · about 5 minutes · Parashari system, Lahiri ayanamsa
By AstroWord · Updated 4 November 2026 · Based on Brihat Parashara Hora Shastra
Some planets race through the zodiac and some crawl. The slow ones shape the big chapters of life.
Lesson notes
- Time spent in one sign: Moon - about 2¼ days Sun - about 1 month Mercury and Venus - about 1 month Mars - about 1½ months
- The slow movers: Jupiter - about 1 year Rahu and Ketu - about 1½ years Saturn - about 2½ years
- Fast planets set the mood of a day or a month. Slow planets - Jupiter, Saturn, Rahu and Ketu - set the themes of whole years. Rahu and Ketu always move backwards through the signs.
Practice questions and answers
- Which planet moves through a sign in about 2¼ days?
- Answer: Moon. The Moon is the fastest of all.
- About how long does Mars stay in one sign?
- Answer: About 1½ months. Mars: about a month and a half.
- Which planet stays longest in one sign?
- Answer: Saturn. Saturn: about 2½ years per sign.
- About how long does Jupiter stay in one sign?
- Answer: About 1 year. Jupiter takes about 12 years to go round all 12 signs.
- True or false: Slow planets like Saturn shape the big themes of a few years.
- Answer: True. Slow transits = long chapters.
- True or false: Rahu and Ketu move forwards through the signs, like the Sun.
- Answer: False. Rahu and Ketu always move backwards.
How long each planet stays in a sign
| Planet | Average time in one sign | Full circle of the zodiac |
|---|---|---|
| Moon | About 2¼ days | About 27.3 days |
| Sun | About 1 month | 1 year |
| Mercury | About 3 to 4 weeks (longer when retrograde) | About 1 year (stays near the Sun) |
| Venus | About 4 weeks (up to 4 months when retrograde) | About 1 year (stays near the Sun) |
| Mars | About 45 days (up to 6 or 7 months when retrograde) | About 1.9 years (687 days) |
| Jupiter | About 1 year (12 to 13 months) | About 11.86 years |
| Saturn | About 2½ years | About 29.5 years |
| Rahu and Ketu | About 18 months (always retrograde) | About 18.6 years |
Fast planets: daily and monthly timing
The Moon
The Moon is the fastest, moving about 13° a day and through a whole nakshatra in about a day. Its transit sets the mood of the day and is used for:
- Daily horoscopes.
- Muhurta (choosing a good time), together with the tithi (lunar day) and nakshatra.
- Chandrashtama: the roughly 2¼ days each month when the Moon transits the 8th sign from your birth Moon, traditionally considered a time to avoid important new starts.
The Sun
The Sun spends about a month in each sign. The Sun's entry into each sidereal sign is called a sankranti: Makar Sankranti (entry into Capricorn, around 14 January) is the best-known festival. The Sun's transit is used to time monthly themes, and its return to its birth position each year marks the solar return (varshaphala) used in annual charts.
Mercury and Venus
These never stray far from the Sun as seen from Earth: Mercury stays within about 28° of it and Venus within about 47°. So they usually sit in the same sign as the Sun or one to two signs either side. Their transits colour communication, trade and travel (Mercury) and love, comforts and finances (Venus) on a weekly to monthly scale.
The middle planet: Mars
Mars spends about 45 days in a sign, but when it turns retrograde (about every 26 months) it can stay in one sign for six months or more. Mars transits time bursts of energy, conflicts, property matters, surgery and competition. Its transit through the 3rd, 6th or 11th from the Moon gives energy and victories; through the 1st, 4th, 8th or 12th it can bring irritability, accidents or disputes.
Slow planets: the big chapters
Jupiter
Jupiter's yearly change of sign is one of the most anticipated events in the Indian calendar (Guru peyarchi or Guru gochar). Moving through the favourable 2nd, 5th, 7th, 9th and 11th houses from your Moon, it brings growth, marriage, children, wealth and good fortune; through the 8th or 12th it asks for caution. Its 12-year cycle means it returns to the same sign around ages 12, 24, 36, 48, 60 and 72, the Jupiter returns. Lesson 28 covers Jupiter's transit in detail.
Saturn
Saturn takes about 2½ years per sign and 29.5 years for the full circle. Its transit shapes long phases: Sade Sati (Lesson 30), the "Saturn return" around ages 29 to 30 and 58 to 59, and the 2½-year phases known as dhaiya or kantaka Shani. Lesson 29 covers Saturn's transit.
Rahu and Ketu
The nodes always move backwards through the zodiac, spending about 18 months in each sign and staying exactly opposite each other. Their transits often coincide with eclipses and bring sudden changes in the areas of life they cross. Their 18.6-year cycle means the "nodal return" happens around ages 18-19, 37, 56 and 74.
Why slow planets matter more
| Factor | Fast planets | Slow planets |
|---|---|---|
| Duration in a sign | Days to weeks | 1 to 2½ years |
| Effect | Short-lived moods and minor events | Long-term conditions and major events |
| Main use | Day-to-day timing, muhurta | Life chapters, major predictions |
| Example | Moon in the 8th from the Moon: an off day | Saturn in the 12th from the Moon: start of Sade Sati |
Astrologers often say slow planets set the stage and fast planets cue the actors. A big event usually happens when the dasha supports it, Jupiter and Saturn activate the relevant house, and a fast planet (often Mars, the Sun or the Moon) touches the same point.
Planetary speed and strength
Speed also matters for strength (cheshta bala, Lesson 16). A planet moving slower than usual, especially when stationary before turning retrograde or direct, is considered intensely focused on the point it occupies. Stationary Saturn or Jupiter on a natal planet often marks a significant event.
Worked example: one month of transits
Suppose your Moon is in Virgo, in a month when:
- Saturn is in Pisces: the 7th from your Moon, unfavourable, so partnerships and public dealings need patience (a long-term background condition).
- Jupiter is in Leo: the 12th from your Moon, so expenses, travel or spiritual retreat (a year-long theme).
- Mars moves into Scorpio: the 3rd from your Moon, favourable, so a burst of courage and energy for about six weeks.
- The Sun is in Libra: the 2nd from your Moon, unfavourable, so a month to watch family friction and spending.
The slow planets define the background of the year; Mars and the Sun bring the month's shorter highs and lows.
Key takeaways
- The Moon changes sign every 2¼ days, the Sun every month, Jupiter every year, Saturn every 2½ years.
- Mercury and Venus stay close to the Sun.
- Mars can stay many months in one sign when retrograde.
- Slow planets shape the big chapters; fast planets time the details.
Sign changes as events
Each time a slow planet changes sign it is called a sankranti or gochar, and in India these are reported as news:
- Guru gochar (Jupiter): about once a year; followed closely for marriage and growth.
- Shani gochar (Saturn): about every 2½ years; decides who enters or leaves Sade Sati.
- Rahu-Ketu gochar: about every 18 months; often near eclipses.
- Surya sankranti (Sun): monthly; Makar Sankranti in January is the biggest festival among them.
Speed and the nakshatras
Within a sign, planets also move through nakshatras. The Moon moves through one nakshatra a day, the Sun through one about every 13 to 14 days, Jupiter through one in about 4 to 5 months and Saturn through one in about a year. Saturn's year in a single nakshatra can be quite noticeable if that nakshatra holds your Moon or Lagna.
| Planet | Time to cross one nakshatra (13°20') |
|---|---|
| Moon | About 1 day |
| Sun | About 13½ days |
| Mars | About 3 weeks to a month (much longer when retrograde) |
| Jupiter | About 5 months |
| Rahu and Ketu | About 8 months |
| Saturn | About 1 year |
The planetary cycles across a lifetime
| Age (approximate) | Slow-planet milestone |
|---|---|
| 12 | First Jupiter return |
| 18 to 19 | First nodal return (Rahu and Ketu back to birth positions) |
| 24 | Second Jupiter return |
| 29 to 30 | First Saturn return |
| 36 to 37 | Third Jupiter return, second nodal return |
| 58 to 60 | Second Saturn return, fifth Jupiter return |
Many people find these ages mark turning points in their lives, which is a good way to see transit cycles at work.
Practice
Take three past events in your life and note your age at each. Compare them with the milestone table. Then look up where Jupiter and Saturn were on those dates and count their houses from your Moon sign.
Fast and slow planets in the daily horoscope
A good daily horoscope blends both speeds. The slow-planet background (where Saturn, Jupiter and the nodes sit from your Moon) tells you the season you are in; the day's Moon tells you the weather today. A "difficult" Moon day during a supportive Jupiter year is a passing cloud. A "good" Moon day during a hard Saturn phase is a welcome break, worth using for important tasks.
Common beginner mistakes
- Giving a Moon transit the weight of a Saturn transit. Duration matters.
- Forgetting retrograde loops. Mars, Jupiter and Saturn can re-enter the previous sign.
- Using tropical sign change dates. Sidereal positions run about 24° behind tropical ones, so a planet changes sidereal sign weeks or even years after its tropical ingress.
- Ignoring Rahu and Ketu. Their 18-month transits are as significant as Jupiter's.
Frequently asked questions
Which planet moves the fastest?
The Moon, which changes sign about every 2¼ days and circles the zodiac in about 27.3 days.
Which planet moves the slowest?
Saturn, among the visible planets, taking about 2½ years per sign and 29.5 years for a full circle.
How long does Jupiter stay in one sign?
About one year, sometimes a few months more or less depending on retrograde motion.
How long does Rahu stay in one sign?
About 18 months. Rahu and Ketu always move backwards and stay opposite each other.
What is chandrashtama?
The period of about 2¼ days each month when the transiting Moon passes through the 8th sign from your birth Moon, traditionally avoided for important beginnings.
How long does the Moon stay in one sign?
About two and a quarter days, so it passes through all twelve signs in about 27.3 days.
How long does Mars stay in one sign?
About 45 days normally, but six months or more when it turns retrograde in that sign.
What is a Saturn return?
Saturn's return to its birth position, about every 29.5 years, at ages around 29 to 30 and 58 to 59. It often marks major life changes and new responsibilities.
Why do Mercury and Venus never move far from the Sun?
Because their orbits lie inside the Earth's. Seen from Earth, Mercury never appears more than about 28 degrees from the Sun and Venus never more than about 47 degrees, so they always sit in or near the Sun's sign.
In the interactive version of this lesson you answer these questions yourself, and the last question uses your own birth chart. Add your birth details on your Learn profile to get it.