Many Hindus use both a lunar and a solar calendar simultaneously, as part of a panchangam. The word means "five limbs". The five parts of a panchangam depend on: 1. the lunar day, 2. the lunar month, 3. the half-day, 4. the angle of the sun and moon, and 5. the solar day.
Some lunar calendars start each month with a new moon, while others start each month with a full moon, and Hindu calendars don't all agree on when a year starts, either.
In an attempt to get everyone in India to use the same calendar, the govermnment introduced an Indian National calendar in 1957. It is a solar calendar with either 365 or 366 days in a year, leap year rules identical to those in the Gregorian calendar, but with years starting near the vernal equinox (March 22 in regular years, March 21 in leap years) and traditional Indian names for the months. Years are counted from the first year of the Saka era, (78 A.D.)
The months of the solar calendar are shown in the following table.
Saur Maas (solar months) |
(season) |
months |
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| Chaitra | (spring) |
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| Vaikasi | ||||
(summer) |
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(monsoon) |
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(autumn) |
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| Vrushchika | ||||
(winter) |
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(dewy) |
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The year is also divided into 6 seasons of two months each.
The ecliptic, the apparent path of the sun through the sky, is dividied into 12 rashi, which are the same as the signs of the zodiac in English. The solar months are based on the rashi.
The ecliptic is also divided into 27 lunar mansions, the nashatra, which means stars in English. There are 3 nashatra in each rashi.
The lunar months, shown below, are named for twelve of the nakshatra. Purushottam is the adhika maas (extra month) added when the lunar months have gotten about 30 days behind in the solar calendar. Lunar months consist of thirty lunar days, or tithis. (Lunar days are not the same length as solar days) In some calendars, lunar months are simply numbered, not named.
(Maas) |
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1 |
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2 |
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3 |
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4 |
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5 |
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6 |
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7 |
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8 |
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9 |
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10 |
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11 |
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12 |
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Months are divided into two halves called paksha.