Trayodashi (त्रयोदशी) dates and timings in Perth for 1981
Verified astronomical start and end times for lunar day 28 in Perth, shown in Australia/Perth.
13 occurrences found. Each end time is exclusive: the next Tithi begins at that instant.
| # | Starts | Ends | Duration | Crosses midnight |
|---|---|---|---|---|
| 1 | 3 Jan 1981, 12:55 pm GMT+8 | 4 Jan 1981, 2:16 pm GMT+8 | 25 hr 21 min | Yes |
| 2 | 2 Feb 1981, 7:54 am GMT+8 | 3 Feb 1981, 7:58 am GMT+8 | 24 hr 4 min | Yes |
| 3 | 4 Mar 1981, 12:23 am GMT+8 | 4 Mar 1981, 11:02 pm GMT+8 | 22 hr 39 min | No |
| 4 | 2 Apr 1981, 1:32 pm GMT+8 | 3 Apr 1981, 10:58 am GMT+8 | 21 hr 26 min | Yes |
| 5 | 1 May 1981, 11:22 pm GMT+8 | 2 May 1981, 7:59 pm GMT+8 | 20 hr 38 min | Yes |
| 6 | 31 May 1981, 6:37 am GMT+8 | 1 Jun 1981, 3:01 am GMT+8 | 20 hr 24 min | Yes |
| 7 | 29 Jun 1981, 12:31 pm GMT+8 | 30 Jun 1981, 9:15 am GMT+8 | 20 hr 44 min | Yes |
| 8 | 28 Jul 1981, 6:25 pm GMT+8 | 29 Jul 1981, 3:58 pm GMT+8 | 21 hr 33 min | Yes |
| 9 | 27 Aug 1981, 1:34 am GMT+8 | 28 Aug 1981, 12:15 am GMT+8 | 22 hr 41 min | Yes |
| 10 | 25 Sept 1981, 11:02 am GMT+8 | 26 Sept 1981, 11:01 am GMT+8 | 23 hr 58 min | Yes |
| 11 | 24 Oct 1981, 11:35 pm GMT+8 | 26 Oct 1981, 12:47 am GMT+8 | 25 hr 12 min | Yes |
| 12 | 23 Nov 1981, 3:29 pm GMT+8 | 24 Nov 1981, 5:40 pm GMT+8 | 26 hr 11 min | Yes |
| 13 | 23 Dec 1981, 10:22 am GMT+8 | 24 Dec 1981, 1:02 pm GMT+8 | 26 hr 40 min | Yes |
How these timings are calculated
BDA calculates the geocentric angular separation of the Moon and Sun and divides the full cycle into 30 equal 12-degree Tithi sectors. UTC boundaries are converted to the timezone resolved from the listed city coordinates.
Scope: These are astronomical Tithi spans only. This page does not choose a festival, Vrat, Parana, or Muhurta date. Those decisions require their separately certified sunrise-prevalence and observance rules.
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