Sign changes
What happens when a planet changes sign
A sign ingress is the moment a planet’s longitude crosses a 30° boundary. See what changes, what does not, and why two zodiacs date it differently.
01 · Crossing a line
An ingress is a planet crossing a sign boundary.
A sign boundary is a line on a measuring scale, every 30° along the ecliptic. When a planet’s longitude reaches one, it enters the next sign. Nothing happens to the planet: only the label changes. Follow the Sun through December 2026 and January 2027 against two scales at once.
The Sun crosses two different lines about 23 days apart. The tropical crossing is the December solstice; the sidereal one is Makar Sankranti.
02 · How often
Fast bodies change sign often; slow ones rarely.
Every sign is the same 30° wide, so the time a body spends in one depends only on how fast it moves along the ecliptic, as seen from Earth.
A line on a scale
The twelve signs divide the ecliptic into equal 30° parts. When a planet’s longitude reaches one of the boundaries between them, at 0°, 30°, 60° and so on, it moves from one sign into the next. That moment is a sign ingress, and in Indian astrology the change of sign is the core of a planetary transit, a gochara (गोचर).
The planet itself does not change at an ingress. It is at the same distance, moving at the same speed, in front of the same stars as a moment before. What changes is the label on the measuring scale. Whatever meaning a tradition attaches to the new sign starts from that labelling, which is why ingress times are tracked so closely.
One instant everywhere
An ingress is defined by the planet’s position as seen from Earth’s centre, so it happens at one instant for the whole world. Each place shows that instant in its own local time. The Sun entered sidereal Capricorn at 20:47 IST on 14 January 2027, which is 15:17 UTC and 10:17 in New York; it is one event, not three.
That makes an ingress different from the elements of a day’s Panchang that depend on local sunrise. The ingress time is shared; which local date or day it falls on is not.
Two zodiacs, two dates
The tropical zodiac measures from the March equinox, and the sidereal zodiac, used by panchang.now, measures from a starting point fixed against the stars. In 2026 the two starting points are about 24.2° apart, so every boundary of one scale sits 24.2° away from the matching boundary of the other.
A planet therefore crosses the two sets of lines at different times. The Sun entered tropical Capricorn at 02:20 IST on 22 December 2026, the moment of the December solstice. It reaches sidereal Capricorn, the moment of Makar Sankranti, at 20:47 IST on 14 January 2027, about 23 days later. Both are real crossings of real lines; they belong to different scales. The sidereal and tropical comparison explains why the two scales exist.
How often each body changes sign
All signs are the same width, so the time a body spends in one depends on its speed against the stars. Between 2026 and 2036, on average:
| Body | Typical time in one sign |
|---|---|
| Moon | About 2¼ days |
| Sun | About a month |
| Mercury and Venus | About a month on average, but irregular |
| Mars | About 2 months |
| Jupiter | About a year |
| Rahu and Ketu | About 18½ months, moving backwards |
| Saturn | About 2½ years |
Mercury, Venus and Mars vary the most. When they appear to move backwards they linger: Mercury’s stay in one sign ran from about 5 to 69 days, and Mars’s from 38 to 232. A planet that turns back near a boundary can even cross it three times, as entering the same sign three times shows.
The Sun’s ingresses mark the solar months, and each is a Sankranti.
See the next sign changes of each planet on the planetary events page, or explore another topic in Learn.