The date of any shrāddha tithi, including Amavasya, can change from one location to another depending on sunrise-sunset timings, as detailed in this video by Brahmashri Bharaneedhara Sastrigal:
The following map shows the tithi for all locations; places to the left of the line in the map have the tithi on 9th June, while those on the right, have the tithi on 10th June.
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Some key locations:
9th June Amavasya
Mumbai, Pune, Udaipur, all of Gujarat, Srinagar
10th June Amavasya
Most of the country, including whole of South India, East, New Delhi, Gurugram, Chandigarh, Jaipur etc.
Variations in Shrāddha tithis on other days in Plava Samvatsara
| Date | Kanchipuram (12.84N, 79.70E) | Delhi (28.57N, 77.16E) | Mumbai (18.95N, 72.83E) |
|---|---|---|---|
| 25-04-21 | Śukla-trayodaśī | Śukla-trayodaśī | Śukla-trayodaśī, Śukla-caturdaśī (tithi-dvayam) |
| 26-04-21 | Śukla-caturdaśī, Paurṇamāsī (tithi-dvayam) | Śukla-caturdaśī, Paurṇamāsī (tithi-dvayam) | Paurṇamāsī |
| 06-05-21 | Kṛṣṇa-ekādaśī | Kṛṣṇa-ekādaśī | |
| 07-05-21 | Kṛṣṇa-ekādaśī | ||
| 26-05-21 | Paurṇamāsī | Paurṇamāsī | Paurṇamāsī, Kṛṣṇa-prathamā (tithi-dvayam) |
| 27-05-21 | Kṛṣṇa-prathamā, Kṛṣṇa-dvitīyā (tithi-dvayam) | Kṛṣṇa-prathamā, Kṛṣṇa-dvitīyā (tithi-dvayam) | Kṛṣṇa-dvitīyā |
| 09-06-21 | Amāvāsyā | ||
| 10-06-21 | Amāvāsyā | Amāvāsyā | |
| 20-06-21 | Śukla-daśamī | Śukla-daśamī, Śukla-ekādaśī (tithi-dvayam) | Śukla-daśamī, Śukla-ekādaśī (tithi-dvayam) |
| 21-06-21 | Śukla-ekādaśī, Śukla-dvādaśī (tithi-dvayam) | Śukla-dvādaśī | Śukla-dvādaśī |
| 27-06-21 | Kṛṣṇa-tṛtīyā | Kṛṣṇa-tṛtīyā, Kṛṣṇa-caturthī (tithi-dvayam) | Kṛṣṇa-tṛtīyā, Kṛṣṇa-caturthī (tithi-dvayam) |
| 28-06-21 | Kṛṣṇa-caturthī, Kṛṣṇa-pañcamī (tithi-dvayam) | Kṛṣṇa-pañcamī | Kṛṣṇa-pañcamī |
| 18-07-21 | śūnyatithiḥ | śūnyatithiḥ | Śukla-navamī |
| 21-07-21 | Śukla-dvādaśī | Śukla-dvādaśī, Śukla-trayodaśī (tithi-dvayam) | Śukla-dvādaśī, Śukla-trayodaśī (tithi-dvayam) |
| 22-07-21 | Śukla-trayodaśī, Śukla-caturdaśī (tithi-dvayam) | Śukla-caturdaśī | Śukla-caturdaśī |
| 16-08-21 | Śukla-navamī | Śukla-navamī | śūnyatithiḥ |
| 18-08-21 | śūnyatithiḥ | śūnyatithiḥ | Śukla-ekādaśī |
| 16-09-21 | Śukla-ekādaśī | Śukla-ekādaśī | śūnyatithiḥ |
| 26-09-21 | Kṛṣṇa-ṣaṣṭhī | Kṛṣṇa-ṣaṣṭhī | |
| 27-09-21 | Kṛṣṇa-ṣaṣṭhī | ||
| 29-10-21 | Kṛṣṇa-navamī | ||
| 30-10-21 | Kṛṣṇa-navamī | Kṛṣṇa-navamī | Kṛṣṇa-daśamī |
| 31-10-21 | Kṛṣṇa-daśamī, Kṛṣṇa-ekādaśī (tithi-dvayam) | Kṛṣṇa-daśamī, Kṛṣṇa-ekādaśī (tithi-dvayam) | Kṛṣṇa-ekādaśī |
| 04-04-22 | Śukla-caturthī | Śukla-caturthī | |
| 05-04-22 | Śukla-caturthī |