Total lunar eclipse in Hong Kong on overnight of September 7
22 August 2025
A total lunar eclipse will occur in Hong Kong on the late night of September 7 (Sunday) to the early hours of September 8 (Monday). The elevation of the moon will be relatively high during the eclipse. The whole event can be directly observed with unaided eyes at places with an unobstructed view to the south and southwest if weather permits.
The lunar eclipse will begin at 11.26pm on September 7. The moon will start entering the umbra of the Earth at 0.27am on September 8 and will be completely engulfed in the umbra at 1.30am, marking the beginning of the phase of total eclipse. The maximum eclipse will occur at 2.12am, and the moon will begin its exit from the umbra at 2.53am. The phase of total eclipse will last for one hour and 23 minutes. During the period, the moon will not completely disappear from sight but will appear dull red. This is the result of the blue light component of the sunlight being scattered by the earth’s atmosphere and the remaining red light being refracted onto the lunar surface. The entire process of lunar eclipse will end at 4.57am on September 8.
Details of this total lunar eclipse are as follows.
| Date | Time | Phenomenon | Elevation | Direction (Azimuth) |
| September 7 (Sunday) | 6.21 pm | Moonrise | -1 degree | East (99 degrees) |
| 11.26 pm | Moon enters penumbra | 58 degrees | South-southeast (156 degrees) |
|
| September 8 (Monday) | 0.27 am | Moon enters umbra | 60 degrees | South (184 degrees) |
| 1.30 am | Total eclipse begins | 56 degrees | South-southwest (213 degrees) |
|
| 2.12 am | Maximum eclipse | 50 degrees | Southwest (227 degrees) |
|
| 2.53 am | Total eclipse ends | 43 degrees | West-southwest (237 degrees) |
|
| 3.57 am | Moon exits umbra | 30 degrees | West-southwest (248 degrees) |
|
| 4.57 am | Moon exits penumbra | 18 degrees | West-southwest (256 degrees) |
On the late night of September 7 to the early hours of September 8, members of the public can watch the whole event via a webcast webpage, to be jointly hosted by the Hong Kong Observatory, the Hong Kong Space Museum, the Ho Koon Nature Education cum Astronomical Centre (sponsored by Sik Sik Yuen), the Po Leung Kuk Ngan Po Ling College and the Creative Education Unit of the Hong Kong Federation of Youth Groups.
For the latest weather conditions and the astronomical observation conditions on September 7 and 8, please refer to the Hong Kong Observatory’s 9-day weather forecast webpage and the Weather Information for Astronomical Observation webpage.
The next lunar eclipse observable in Hong Kong will be a total lunar eclipse on March 3, 2026.
Figure 1 The total lunar eclipse process from the late night of September 7 to the small hours of September 8, 2025.
Figure 2 Schematic diagram showing elevation and azimuth of the moon during the eclipse on September 7 to 8, 2025.