Paksha (or pakṣa: Sanskrit: पक्ष), thwa and gа̄ (𑐠𑑂𑐰𑑅 / 𑐐𑐵𑑅, थ्वः / गाः) in Nepal Bhasa, refers to a fortnight or a lunar phase in a month of the Hindu lunar calendar.
Literally meaning "side", a paksha is the period either side of the Full Moon Day (Purnima). A lunar month in the Hindu calendar has two fortnights, and begins with the New moon, (Amavasya). The lunar days are called tithis and each month has 30 tithis, which may vary from 20 – 27 hours. A paksha has 15 tithis, which are calculated by a 12 degree motion of the Moon. The first fortnight between New Moon Day and Full Moon Day is called "Gaura Paksha" or Shukla Paksha (lit. 'white/bright/golden side') the period of the brightening moon (waxing moon), and the second fortnight of the month is called "Vadhya Paksha" or Krishna Paksha (lit. 'dark/black side'), the period of the fading moon (waning moon). Neemuch Panchang begin new lunar month from first day of Krishna Paksha while Gujarat Panchang begin new lunar month from first day of Shukla Paksha.
|Shukla Paksha||Krishna Paksha|
|1. Prathama||1. Prathama|
|2. Dwitiya||2. Dwitiya|
|3. Tritiya||3. Tritiya|
|4. Chaturthi||4. Chaturthi|
|5. Panchami||5. Panchami|
|6. Shashti||6. Shashti|
|7. Saptami||7. Saptami|
|8. Ashtami||8. Ashtami|
|9. Navami||9. Navami|
|10. Dashami||10. Dashami|
|11. Ekadashi||11. Ekadashi|
|12. Dwadashi||12. Dwadashi|
|13. Thrayodashi||13. Thrayodashi|
|14. Chaturdashi||14. Chaturdashi|
|15. Purnima||15. Amavasya, Ausi|
Shukla paksha, thwa (𑐠𑑂𑐰𑑅, थ्वः) in Nepal Bhasa, refers to the bright lunar fortnight or waxing moon in the Hindu calendar. Shukla (Sanskrit: शुक्ल) is Sanskrit word for "white" or "bright".
Shukla Paksha (Waxing Moon period) is a period of 15 days, which begins on the Shukla Amavasya (New Moon) day and culminating Purnima (Full Moon) day and is considered auspicious because it is favorable to growth or expansion on every plane of existence i.e. Mental, Physical and Spiritual Plane.
Numerous festivals are held during this period, including the Navratri festivals, most importantly Chaitra Navratri and Ashvin Navratri.
|1st Day||Pratipada||Bali Pratipada, Govardhan Puja||Kartika|
|3rd Day||Tritiya||Akshaya Tritiya||Vaishakha|
|4th Day||Chaturthi||Ganesh Chaturthi||Bhadrapada|
|4th Day||Chaturthi||Ganesh Jayanti||Magha|
|5th Day||Panchami||Vivaha Panchami||Margashirsha|
|5th Day||Panchami||Basant Panchami||Magha|
|9th Day||Navami||Rama Navami||Chaitra|
|11th Day||Ekadasi||Shayani Ekadashi||Asadha|
|11th Day||Ekadashi||Vaikunta Ekadashi||Margashirsha|
|15th Day (Full Moon)||Poornima||Guru Purnima||Ashada|
Krishna paksha, gа̄ (𑐐𑐵𑑅, गाः) in Nepal Bhasa, refers to the dark lunar fortnight or waning moon in the Hindu calendar. Krishna (Sanskrit: कृष्ण) is Sanskrit for "dark". Krishna Paksha is a period of 15 days, which begins on the (Full Moon) day (Purnima), culminating on (New Moon) day (Amavasya). Krishna Paksha is considered inauspicious, as the moon loses light during this period.
Festivals during Krishna Paksha are:
|4th Day||Chaturthi||Karva Chauth||Kartika|
|8th Day||Ashtami||Krishna Janmashtami||Shraavana|
|14th Day||Chaturdashi||Maha Shivaratri||Maagha|
|14th Day||Chaturdashi||Naraka Chaturdashi (Diwali)||Kartika|
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.