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: 03-02 (69), 03-03 (69), 03-04 (67), 03-05 (66), 03-06 (64) — by astronomy; check the weather when the night is within four days.

2029-02-25astronomy score per night — click a bar for that night2029-03-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-02-25 Sun	23	—	unknown	19:40–22:55 (marginal, 3.25 h)	72.5° 17:45	9.81	89%	60.2°
2029-02-26 Mon	30	—	unknown	19:45–19:55 (good, 0.17 h)	72.5° 17:40	9.77	95%	74.6°
2029-02-27 Tue	40	—	unknown	19:45–21:20 (good, 1.58 h)	72.5° 17:40	9.72	99%	89.3°
2029-02-28 Wed	51	—	unknown	19:45–22:20 (good, 2.58 h)	72.5° 17:35	9.68	100%	104.3°
2029-03-01 Thu	63	—	unknown	19:45–22:30 (good, 2.75 h)	72.5° 17:30	9.63	98%	119.4°
2029-03-02 Fri	69	—	unknown	19:50–22:30 (good, 2.67 h)	72.5° 17:25	9.59	92%	134.5°
2029-03-03 Sat	69	—	unknown	19:50–22:25 (good, 2.58 h)	72.5° 17:20	9.54	85%	149.4°
2029-03-04 Sun	67	—	unknown	19:50–22:30 (good, 2.67 h)	72.5° 17:20	9.5	76%	164.0°
2029-03-05 Mon	66	—	unknown	19:50–22:25 (good, 2.58 h)	72.5° 17:15	9.45	65%	178.1°
2029-03-06 Tue	64	—	unknown	19:50–22:20 (good, 2.5 h)	72.5° 17:10	9.4	54%	167.9°
2029-03-07 Wed	61	—	unknown	19:55–22:20 (good, 2.42 h)	72.5° 17:05	9.35	44%	154.5°
2029-03-08 Thu	59	—	unknown	19:55–22:15 (good, 2.33 h)	72.5° 17:05	9.31	33%	141.4°
2029-03-09 Fri	56	—	unknown	19:55–22:10 (good, 2.25 h)	72.5° 17:00	9.26	24%	128.6°
2029-03-10 Sat	55	—	unknown	19:55–22:05 (good, 2.17 h)	72.5° 16:55	9.21	16%	116.1°
2029-03-11 Sun	52	—	unknown	20:00–22:00 (good, 2.0 h)	72.5° 16:50	9.16	10%	103.7°
2029-03-12 Mon	50	—	unknown	20:00–22:00 (good, 2.0 h)	72.5° 16:45	9.11	5%	91.6°
2029-03-13 Tue	47	—	unknown	20:00–21:55 (good, 1.92 h)	72.5° 16:45	9.06	2%	79.5°
2029-03-14 Wed	45	—	unknown	20:00–21:50 (good, 1.83 h)	72.5° 16:40	9.01	0%	67.6°
2029-03-15 Thu	43	—	unknown	20:05–21:45 (good, 1.67 h)	72.5° 16:35	8.96	1%	55.7°
2029-03-16 Fri	41	—	unknown	20:05–21:40 (good, 1.58 h)	72.5° 16:30	8.91	3%	43.9°
2029-03-17 Sat	37	—	unknown	20:05–21:40 (good, 1.58 h)	72.5° 16:25	8.86	7%	32.1°
2029-03-18 Sun	33	—	unknown	20:05–21:30 (good, 1.42 h)	72.5° 16:25	8.81	12%	20.2°
2029-03-19 Mon	28	—	unknown	20:10–21:20 (good, 1.17 h)	72.5° 16:20	8.76	19%	8.3°
2029-03-20 Tue	23	—	unknown	20:10–21:10 (good, 1.0 h)	72.5° 16:15	8.71	27%	3.8°
2029-03-21 Wed	18	—	unknown	20:10–20:55 (good, 0.75 h)	72.5° 16:10	8.66	36%	16.0°
2029-03-22 Thu	13	—	unknown	20:10–21:40 (marginal, 1.5 h)	72.5° 16:10	8.6	46%	28.5°
2029-03-23 Fri	10	—	unknown	20:15–21:30 (marginal, 1.25 h)	72.5° 16:05	8.55	56%	41.3°
2029-03-24 Sat	9	—	unknown	20:15–21:25 (marginal, 1.17 h)	72.5° 16:00	8.5	67%	54.6°
2029-03-25 Sun	9	—	unknown	21:15–22:20 (marginal, 1.08 h)	72.5° 16:55	8.45	77%	68.4°
2029-03-26 Mon	10	—	unknown	21:15–22:25 (marginal, 1.17 h)	72.5° 16:50	8.39	86%	82.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-02-25&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.