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: 03-05 (46), 03-06 (36), 03-18 (36), 03-19 (36), 03-16 (34) — by astronomy; check the weather when the night is within four days.

2033-03-05astronomy score per night — click a bar for that night2033-04-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-03-05 Sat	46	—	unknown	19:50–22:15 (good, 2.42 h)	72.6° 17:15	9.45	28%	12.6°
2033-03-06 Sun	36	—	unknown	19:50–22:00 (good, 2.17 h)	72.6° 17:10	9.4	38%	8.2°
2033-03-07 Mon	26	—	unknown	19:55–20:05 (good, 0.17 h)	72.6° 17:05	9.35	49%	18.4°
2033-03-08 Tue	19	—	unknown	19:55–22:30 (marginal, 2.58 h)	72.6° 17:05	9.31	59%	30.7°
2033-03-09 Wed	17	—	unknown	19:55–22:20 (marginal, 2.42 h)	72.6° 17:00	9.26	69%	43.0°
2033-03-10 Thu	16	—	unknown	19:55–22:15 (marginal, 2.33 h)	72.6° 16:55	9.21	78%	55.2°
2033-03-11 Fri	17	—	unknown	20:00–22:15 (marginal, 2.25 h)	72.6° 16:50	9.16	85%	67.3°
2033-03-12 Sat	20	—	unknown	20:00–22:15 (marginal, 2.25 h)	72.6° 16:45	9.11	91%	79.2°
2033-03-13 Sun	24	—	unknown	20:00–20:40 (good, 0.67 h)	72.6° 16:45	9.06	96%	91.0°
2033-03-14 Mon	29	—	unknown	20:00–21:25 (good, 1.42 h)	72.6° 16:40	9.01	99%	102.8°
2033-03-15 Tue	32	—	unknown	20:05–21:30 (good, 1.42 h)	72.6° 16:35	8.96	100%	114.5°
2033-03-16 Wed	34	—	unknown	20:05–21:30 (good, 1.42 h)	72.6° 16:30	8.91	99%	126.2°
2033-03-17 Thu	33	—	unknown	20:05–21:30 (good, 1.42 h)	72.6° 16:30	8.86	97%	137.9°
2033-03-18 Fri	36	—	unknown	20:05–21:30 (good, 1.42 h)	72.6° 16:25	8.81	93%	149.6°
2033-03-19 Sat	36	—	unknown	20:10–21:30 (good, 1.33 h)	72.6° 16:20	8.76	87%	161.0°
2033-03-20 Sun	34	—	unknown	20:10–21:25 (good, 1.25 h)	72.6° 16:15	8.71	80%	170.8°
2033-03-21 Mon	32	—	unknown	20:10–21:25 (good, 1.25 h)	72.6° 16:10	8.65	71%	169.8°
2033-03-22 Tue	30	—	unknown	20:10–21:20 (good, 1.17 h)	72.6° 16:10	8.6	62%	159.1°
2033-03-23 Wed	28	—	unknown	20:15–21:15 (good, 1.0 h)	72.6° 16:05	8.55	52%	146.7°
2033-03-24 Thu	26	—	unknown	20:15–21:10 (good, 0.92 h)	72.6° 16:00	8.5	41%	133.7°
2033-03-25 Fri	25	—	unknown	20:15–21:05 (good, 0.83 h)	72.6° 15:55	8.44	30%	120.1°
2033-03-26 Sat	23	—	unknown	20:15–21:05 (good, 0.83 h)	72.6° 15:50	8.39	20%	106.1°
2033-03-27 Sun	21	—	unknown	21:20–22:00 (good, 0.67 h)	72.6° 16:50	8.34	12%	91.6°
2033-03-28 Mon	20	—	unknown	21:20–21:55 (good, 0.58 h)	72.6° 16:45	8.28	5%	76.7°
2033-03-29 Tue	18	—	unknown	21:20–21:50 (good, 0.5 h)	72.6° 16:40	8.23	1%	61.7°
2033-03-30 Wed	16	—	unknown	21:20–21:50 (good, 0.5 h)	72.6° 16:35	8.18	0%	46.7°
2033-03-31 Thu	13	—	unknown	21:25–21:45 (good, 0.33 h)	72.6° 16:35	8.12	2%	31.9°
2033-04-01 Fri	11	—	unknown	21:25–21:35 (good, 0.17 h)	72.6° 16:30	8.07	7%	17.8°
2033-04-02 Sat	9	—	unknown	21:25–21:30 (good, 0.08 h)	72.6° 16:25	8.01	14%	7.7°
2033-04-03 Sun	6	—	unknown	21:30–22:00 (marginal, 0.5 h)	72.6° 16:20	7.96	23%	14.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-03-05&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.