Shukla and Krishna Paksha: The Two Fortnights

Read paksha and tithi together

Paksha identifies a half of the lunar cycle. Shukla is the waxing half, moving from new moon toward full moon; Krishna is the waning half, moving from full moon toward new moon. A name such as Ekadashi occurs in both halves. “Ekadashi” alone therefore leaves out information needed to identify an observance.

The Moon’s changing illuminated appearance provides the astronomical background. A tithi is a calendar division, however, so a photograph or an illumination percentage is not a substitute for the tithi’s calculated start and end times.

A calendar-reading example

Imagine that your selected date shows Krishna Paksha and Chaturthi. Read these as one label: the fourth tithi of the waning half. If another page shows Shukla Chaturthi, it is describing the other half of the cycle, even though both use the word Chaturthi. This example is a way to read the fields, not a declaration of today’s festival.

When sharing the entry, include the complete pair, the civil date, and the city. If an end time is shown, copy that too. A message containing only “Chaturthi tomorrow” loses information and may be misunderstood by someone checking the calendar after midnight.

Why fifteen tithis are not fifteen fixed dates

Each half contains fifteen tithis, but a tithi does not start automatically at civil midnight. A transition can happen during the day. Consequently, counting fifteen boxes on a wall calendar is not a reliable method of predicting the next paksha boundary. Use the dated record and its transition information.

When month names differ

Amanta and purnimanta calendars place their month boundaries differently. Compare the full date, paksha, tithi and timing before concluding that different month labels describe different astronomical events. For an observance, use the regional calendar followed by your household or temple.

On Tithi.live, first select the place and date, then read paksha beside tithi. If either field is unavailable, leave that part of your note blank rather than inferring it from a horoscope or a neighbouring day. Report a missing or contradictory pair with its URL so it can be checked.

Frequently asked questions

Is Krishna paksha “bad”?

No. Krishna paksha is the waning fortnight. Many important vratas live there. “Dark” describes moonlight, not morality.

Sources and further reading

• U.S. Naval Observatory — phases of the Moon

  Astronomical background for waxing, waning and illumination; not a source of ritual rules.