Paksa
Encyclopedia
Paksha relates to the time period of a fortnight
Fortnight
The fortnight is a unit of time equal to fourteen days, or two weeks. The word derives from the Old English fēowertyne niht, meaning "fourteen nights"....

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Pakṣa literally means the flank or side half of anything. Its most common use though refers to the two parts of the lunar month created by the Moon’s waxing and waning
Lunar phase
A lunar phase or phase of the moon is the appearance of the illuminated portion of the Moon as seen by an observer, usually on Earth. The lunar phases change cyclically as the Moon orbits the Earth, according to the changing relative positions of the Earth, Moon, and Sun...

. The waxing phase of the Moon is called Shukla-paksha (Śukla-pakṣa)- the white half of the Moon. The waning phase of the Moon is called Krishna-paksha (kṛṣṇa-pakṣa)-the dark half.

Each pakṣa is composed of 15 tithis. A tithi
Tithi
In vedic timekeeping, a tithi is a lunar day, or the time it takes for the longitudinal angle between the moon and the sun to increase by 12°. Tithis begin at varying times of day and vary in duration from approximately 19 to approximately 26 hours. There are 30 tithis in each lunar month, named...

 is calculated by 12 degree motion of the Moon. 30 tithis or two pakṣas make one synodic lunar month
Lunisolar calendar
A lunisolar calendar is a calendar in many cultures whose date indicates both the moon phase and the time of the solar year. If the solar year is defined as a tropical year then a lunisolar calendar will give an indication of the season; if it is taken as a sidereal year then the calendar will...

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Usage

Pakṣa can refer to the actual phase of the Moon or to the period of time related to half a lunar month (fortnight).

In Vedic astrology when a person does a prasna (a question chart) and the planet Venus indicates the time period, the event referred to in the answer will happen in a pakṣa (fortnight) from the time the question was asked.
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