Seeing the Lunar X, sunrise on the Moon, and occultation of Chi Leo. Wednesday, June 3, 2025
Western evening sky on Wednesday, June 3 as seen from Adelaide at 22:31 ACST | Western evening sky on Wednesday, June 3 as seen from Sydney at 23:18 AEST | Western evening sky on Wednesday, June 3 as seen from Perth at 21:18 AWST |
Sunrise on the Moon: Moon at 19:00 ACDST, the Lunar V is just becoming visible. | Sunrise on the Moon: Moon at 22:00 ACDST, the Lunar V is becoming visible. Some crater walls are beginning to light up and the first hints of the Lunar X are there. | Sunrise on the Moon: Moon at 23:00 ACDST, the Lunar V is visible. Some crater walls are lighting up and the Lunar X is clear. |
The Lunar X (also known as the Werner X) and the Lunar V will be visible this Saturday as the moon reaches First Quarter. The Lunar X is a chiaroscuro effect in which strong contrasts of light and shadow create the appearance of a letter ‘X’ on the rim of the Lunar craters Blanchinus, La Caille and Purbach and a letter V from the rim of the crater Ukert, along with several smaller craters.
The X and V are seen at first quarter, visible on the lunar surface for about 4 hours. However, the Moon is not always above the horizon from a given vantage point when this happens. This month is okay for Australian observers, with the Moon low to the horizon in the eastern sates, and reasonably high on the west coast.
Lunar X occurs on Wednesday, June 3, 13:18 UT, 23:13 AEST, 22:30 ACST, 21:11 AWST). This is later than official first Quarter which occurs at 13:11 ACST.
This is a telescope (and maybe good binoculars) only event. For the west coast the start of the Lunar X occurs with the Moon being 36° above the horizon, central states see it at 24° above the horizon, and for the east coast at 9° above the horizon.
Upcoming Lunar X’ s are shown below:
Dates and time Lunar X and V are visible. Typically visible from about 4hours from the starting time, times in colour are daylight saving times.
Date | UT | AEST | ACST | AWST |
Feb 5 | 08:13 | 21:13 |
20:43 |
16:13 |
Apr 5 | 12:43 | 23:43 |
23:17 |
20:43 |
June 3 | 13:18 | 23:18 | 22:30 | 21:18 |
Aug 1 | 10:57 | 20:57 | 20:17 | 18:57 |
Sep 29 | 08:46 | 18:46 | 18:16 | 16:46 |
Nov 27 | 10:43 |
21:43 |
21:15 |
18:43 |
If you are setting up to see the Lunar X, why not start early so you can watch sunrise on the Moon? You can watch the sides of crater walls light up as hours progress.Starting from nautical twilight, an hour after sunset, image the Moon through binoculars of a telescope every hour until around moon set and you can see the walls of the Lunar V light up, then the walls of the X.
Also if you are setting up early, catch the reappearance of Chi Leo from occultation by the Moon. this is an occulation in the late twilight, Darwin and Perth miss out.
The moon as seen from Adelaide at 17:750 ACST as Chi Leo is reappearing from occultation. | The telescopic view of the moon as seen from Adelaide at 17:750 ACST as Chi Leo is reappearing from occultation. |
City | Disappear dark | Reappear bright |
Adelaide ACST | - | 17:50 |
Brisbane AEST | - | 18:32 |
Canberra AEST | - | 18:44 |
Hobart AEST | 17:31 | 18:45 |
Melbourne AEST | - | 18:37 |
Sydney AEST | - | 18:46 |
Source: http://astroblogger.blogspot.com/2025/06/seeing-lunar-x-sunrise-on-moon-and.html
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