Rozhen Observation Calendar

Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.

Best nights for Seven Sisters: 03-14 (47), 03-13 (46), 03-15 (44), 03-12 (42), 03-16 (42) — by astronomy; check the weather when the night is within four days.

2047-03-06astronomy score per night — click a bar for that night2047-04-04

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-03-06 Wed	17	—	unknown	19:50–22:30 (marginal, 2.67 h)	72.6° 17:15	9.42	70%	39.5°
2047-03-07 Thu	17	—	unknown	19:55–22:25 (marginal, 2.5 h)	72.6° 17:10	9.37	79%	52.7°
2047-03-08 Fri	19	—	unknown	19:55–22:25 (marginal, 2.5 h)	72.6° 17:05	9.32	87%	66.4°
2047-03-09 Sat	23	—	unknown	19:55–20:00 (good, 0.08 h)	72.6° 17:00	9.28	94%	80.5°
2047-03-10 Sun	30	—	unknown	19:55–21:15 (good, 1.33 h)	72.6° 16:55	9.23	98%	95.1°
2047-03-11 Mon	37	—	unknown	20:00–21:45 (good, 1.75 h)	72.6° 16:55	9.18	100%	109.9°
2047-03-12 Tue	42	—	unknown	20:00–21:50 (good, 1.83 h)	72.6° 16:50	9.13	99%	125.0°
2047-03-13 Wed	46	—	unknown	20:00–21:50 (good, 1.83 h)	72.6° 16:45	9.08	95%	140.1°
2047-03-14 Thu	47	—	unknown	20:00–21:55 (good, 1.92 h)	72.6° 16:40	9.03	88%	155.0°
2047-03-15 Fri	44	—	unknown	20:05–21:50 (good, 1.75 h)	72.6° 16:40	8.98	79%	169.8°
2047-03-16 Sat	42	—	unknown	20:05–21:45 (good, 1.67 h)	72.6° 16:35	8.93	69%	175.9°
2047-03-17 Sun	41	—	unknown	20:05–21:40 (good, 1.58 h)	72.6° 16:30	8.88	58%	161.8°
2047-03-18 Mon	39	—	unknown	20:05–21:35 (good, 1.5 h)	72.6° 16:25	8.83	47%	148.2°
2047-03-19 Tue	36	—	unknown	20:10–21:35 (good, 1.42 h)	72.6° 16:20	8.78	37%	135.0°
2047-03-20 Wed	34	—	unknown	20:10–21:30 (good, 1.33 h)	72.6° 16:20	8.73	27%	122.0°
2047-03-21 Thu	33	—	unknown	20:10–21:25 (good, 1.25 h)	72.6° 16:15	8.67	18%	109.3°
2047-03-22 Fri	31	—	unknown	20:10–21:20 (good, 1.17 h)	72.6° 16:10	8.62	12%	96.9°
2047-03-23 Sat	29	—	unknown	20:15–21:15 (good, 1.0 h)	72.6° 16:05	8.57	6%	84.6°
2047-03-24 Sun	27	—	unknown	20:15–21:15 (good, 1.0 h)	72.6° 16:00	8.52	2%	72.5°
2047-03-25 Mon	25	—	unknown	20:15–21:10 (good, 0.92 h)	72.6° 16:00	8.46	0%	60.5°
2047-03-26 Tue	24	—	unknown	20:15–21:05 (good, 0.83 h)	72.6° 15:55	8.41	0%	48.5°
2047-03-27 Wed	22	—	unknown	20:20–21:00 (good, 0.67 h)	72.6° 15:50	8.36	2%	36.7°
2047-03-28 Thu	20	—	unknown	20:20–21:00 (good, 0.67 h)	72.6° 15:45	8.3	6%	24.9°
2047-03-29 Fri	17	—	unknown	20:20–20:50 (good, 0.5 h)	72.6° 15:45	8.25	10%	13.1°
2047-03-30 Sat	14	—	unknown	20:20–20:40 (good, 0.33 h)	72.6° 15:40	8.2	17%	1.2°
2047-03-31 Sun	10	—	unknown	21:25–21:30 (good, 0.08 h)	72.6° 16:35	8.14	25%	10.8°
2047-04-01 Mon	8	—	unknown	21:25–22:10 (marginal, 0.75 h)	72.6° 16:30	8.09	33%	22.9°
2047-04-02 Tue	6	—	unknown	21:25–22:05 (marginal, 0.67 h)	72.6° 16:25	8.03	43%	35.3°
2047-04-03 Wed	4	—	unknown	21:25–21:55 (marginal, 0.5 h)	72.6° 16:25	7.98	53%	48.0°
2047-04-04 Thu	3	—	unknown	21:30–21:50 (marginal, 0.33 h)	72.6° 16:20	7.92	63%	61.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-03-06&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.