international
World Hydrography Day
روز جهانی آبنگاری (هیدروگرافی)
When: every year on 21 June (Gregorian).
Next date: Monday 31 Khordad 1406 (21 June 2027)
Held by the International Hydrographic Organization to highlight the work of hydrographers in surveying and charting seas and waterways for safe navigation.
World Hydrography Day in the years ahead
| Year | Date | Weekday | Gregorian |
|---|---|---|---|
| 1404 | 31 Khordad | Saturday | 21 June 2025 |
| 1405 | 31 Khordad | Sunday | 21 June 2026 |
| 1406 | 31 Khordad | Monday | 21 June 2027 |
| 1407 | 1 Tir | Wednesday | 21 June 2028 |
| 1408 | 1 Tir | Thursday | 21 June 2029 |
| 1409 | 31 Khordad | Friday | 21 June 2030 |
| 1410 | 31 Khordad | Saturday | 21 June 2031 |