Diamond Fuji at Lake Tanuki
Short answer: Next Diamond Fuji from Lake Tanuki: Mon 19 April 2027 at 06:10 (sunrise). In the next 12 months: 19 April 2027 (06:10), 20 April 2027 (06:09), 24 August 2027 (06:13), 25 August 2027 (06:14).
From Lake Tanuki, west of Fuji, the sun rises out of the summit around 20 April and in late August. It is one of the few places to see a sunrise Diamond Fuji over water.
Sat 7 November 2026 · summit at 84.0° bearing, 11.20° up, 16 km away
No Diamond Fuji
The sun rises 35.2° to the right of the summit at 07:19; not a Diamond Fuji day. Next Diamond Fuji from here: Mon 19 April 2027 at 06:10.
Moonrise over Fuji at 05:10, 27.6° to the right of the summit (moon 6% lit).
Diamond Fuji days (next 12 months)
| Date | Time | Position |
|---|---|---|
| Sun 18 Apr 2027 | 06:12 sunrise | 0.8° to the right of the summit |
| Mon 19 Apr 2027 | 06:10 sunrise | On the summit |
| Tue 20 Apr 2027 | 06:09 sunrise | On the summit |
| Wed 21 Apr 2027 | 06:08 sunrise | 0.5° to the left of the summit |
| Mon 23 Aug 2027 | 06:12 sunrise | 0.4° to the left of the summit |
| Tue 24 Aug 2027 | 06:13 sunrise | On the summit |
| Wed 25 Aug 2027 | 06:14 sunrise | On the summit |
Pearl Fuji: the moon on the summit
| Date | Time | Position | Moon lit |
|---|---|---|---|
| Mon 30 Nov 2026 | 23:36 moonrise | 0.5° to the left of the summit | 59% |
| Fri 16 Apr 2027 | 14:33 moonrise | On the summit (Pearl Fuji) | 76% |
| Sun 25 Jul 2027 | 23:06 moonrise | 0.8° to the left of the summit | 61% |
| Fri 15 Oct 2027 | 17:37 moonrise | On the summit (Pearl Fuji) | 100% |
Plan it
The sunrise comes about an hour after the official sunrise, because the sun has to climb above the mountain. The campsite on the north shore fills up on Diamond Fuji weekends.
Questions
When is Diamond Fuji at Lake Tanuki?
Next Diamond Fuji from Lake Tanuki: Mon 19 April 2027 at 06:10 (sunrise). In the next 12 months: 19 April 2027 (06:10), 20 April 2027 (06:09), 24 August 2027 (06:13), 25 August 2027 (06:14). The sun is close to the summit for a day or two either side; see the full table.
What time does Diamond Fuji happen at Lake Tanuki?
It is a sunrise event: the sun rises out of the summit, later than the official sunrise because it has to clear the mountain. On 19 April 2027 it is at 06:10.
When is Pearl Fuji at Lake Tanuki?
With a moon at least half lit on the summit: 16 April 2027 (14:33, 76% lit), 15 October 2027 (17:37, 100% lit).
What are the chances of seeing it?
Fuji has to be clear of cloud on the horizon side. Winter mornings and evenings are clearest; from June to August Fuji is hidden more often than not. See our clear-view odds for Mount Fuji.
How do you calculate it?
For each spot we work out the direction of Fuji's summit and how high it appears above the horizon, allowing for the curve of the Earth and normal refraction. Then, for every day, we find the moment the sun (or moon) sinks to, or rises from, that height and measure how far left or right of the summit it is. Within about 0.4° the sun's disc sits on the summit: that is a Diamond Fuji. Pearl Fuji is the same with a moon at least half lit.
Summit bearing 84.0°, apparent height 11.20°, distance 16 km. Times are Japan time. Moving a few hundred metres along the shore shifts the best day by a day or so.