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: 01-10 (100), 01-11 (100), 01-12 (100), 01-13 (100), 01-14 (100) — by astronomy; check the weather when the night is within four days.

2032-01-10astronomy score per night — click a bar for that night2032-02-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-01-10 Sat	100	—	unknown	18:50–02:00 (good, 7.17 h)	72.5° 20:50	11.33	5%	155.2°
2032-01-11 Sun	100	—	unknown	18:50–01:55 (good, 7.08 h)	72.5° 20:45	11.31	1%	140.5°
2032-01-12 Mon	100	—	unknown	18:55–01:55 (good, 7.0 h)	72.5° 20:40	11.3	0%	125.4°
2032-01-13 Tue	100	—	unknown	18:55–01:50 (good, 6.92 h)	72.5° 20:40	11.28	2%	110.2°
2032-01-14 Wed	100	—	unknown	18:55–01:45 (good, 6.83 h)	72.5° 20:35	11.26	7%	95.1°
2032-01-15 Thu	100	—	unknown	18:55–01:40 (good, 6.75 h)	72.5° 20:30	11.23	14%	80.3°
2032-01-16 Fri	100	—	unknown	18:55–01:35 (good, 6.67 h)	72.5° 20:25	11.21	23%	65.9°
2032-01-17 Sat	94	—	unknown	19:00–01:35 (good, 6.58 h)	72.5° 20:20	11.19	33%	51.9°
2032-01-18 Sun	85	—	unknown	19:00–01:30 (good, 6.5 h)	72.5° 20:20	11.17	44%	38.3°
2032-01-19 Mon	66	—	unknown	19:40–01:00 (good, 5.33 h)	72.5° 20:15	11.14	55%	25.4°
2032-01-20 Tue	52	—	unknown	19:00–01:45 (marginal, 6.75 h)	72.5° 20:10	11.12	65%	13.1°
2032-01-21 Wed	36	—	unknown	19:00–01:30 (marginal, 6.5 h)	72.5° 20:05	11.09	74%	5.3°
2032-01-22 Thu	25	—	unknown	19:05–01:15 (marginal, 6.17 h)	72.5° 20:05	11.07	82%	13.9°
2032-01-23 Fri	20	—	unknown	19:05–00:45 (marginal, 5.67 h)	72.5° 20:00	11.04	89%	25.5°
2032-01-24 Sat	23	—	unknown	19:05–23:05 (marginal, 4.0 h)	72.5° 19:55	11.01	94%	37.3°
2032-01-25 Sun	32	—	unknown	19:05–00:40 (marginal, 5.58 h)	72.5° 19:50	10.99	98%	49.1°
2032-01-26 Mon	46	—	unknown	18:35–00:50 (marginal, 6.25 h)	72.5° 19:45	10.96	100%	60.9°
2032-01-27 Tue	62	—	unknown	19:10–21:25 (good, 2.25 h)	72.5° 19:45	10.93	100%	72.7°
2032-01-28 Wed	78	—	unknown	19:10–22:55 (good, 3.75 h)	72.5° 19:40	10.9	98%	84.4°
2032-01-29 Thu	100	—	unknown	19:10–00:10 (good, 5.0 h)	72.5° 19:35	10.87	95%	96.3°
2032-01-30 Fri	100	—	unknown	19:10–00:25 (good, 5.25 h)	72.5° 19:30	10.84	90%	108.2°
2032-01-31 Sat	100	—	unknown	19:15–00:30 (good, 5.25 h)	72.5° 19:25	10.8	83%	120.2°
2032-02-01 Sun	100	—	unknown	19:15–00:25 (good, 5.17 h)	72.5° 19:25	10.77	76%	132.3°
2032-02-02 Mon	100	—	unknown	19:15–00:25 (good, 5.17 h)	72.5° 19:20	10.74	66%	144.6°
2032-02-03 Tue	100	—	unknown	19:15–00:25 (good, 5.17 h)	72.5° 19:15	10.71	57%	157.0°
2032-02-04 Wed	100	—	unknown	19:15–00:20 (good, 5.08 h)	72.5° 19:10	10.67	46%	169.3°
2032-02-05 Thu	100	—	unknown	19:20–00:20 (good, 5.0 h)	72.5° 19:10	10.64	36%	173.1°
2032-02-06 Fri	100	—	unknown	19:20–00:15 (good, 4.92 h)	72.5° 19:05	10.6	25%	161.1°
2032-02-07 Sat	100	—	unknown	19:20–00:10 (good, 4.83 h)	72.5° 19:00	10.57	16%	147.0°
2032-02-08 Sun	100	—	unknown	19:20–00:05 (good, 4.75 h)	72.5° 18:55	10.53	8%	132.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-01-10&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.