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: 03-10 (54), 03-11 (51), 03-12 (49), 03-13 (45), 03-14 (39) — by astronomy; check the weather when the night is within four days.

2032-03-10astronomy score per night — click a bar for that night2032-04-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-03-10 Wed	54	—	unknown	19:55–22:05 (good, 2.17 h)	72.5° 16:55	9.2	1%	79.0°
2032-03-11 Thu	51	—	unknown	20:00–22:00 (good, 2.0 h)	72.5° 16:50	9.15	0%	64.2°
2032-03-12 Fri	49	—	unknown	20:00–21:55 (good, 1.92 h)	72.5° 16:45	9.1	2%	49.6°
2032-03-13 Sat	45	—	unknown	20:00–21:55 (good, 1.92 h)	72.5° 16:40	9.05	7%	35.4°
2032-03-14 Sun	39	—	unknown	20:00–21:45 (good, 1.75 h)	72.5° 16:40	9.0	14%	21.8°
2032-03-15 Mon	33	—	unknown	20:05–21:35 (good, 1.5 h)	72.5° 16:35	8.95	22%	9.5°
2032-03-16 Tue	26	—	unknown	20:05–21:25 (good, 1.33 h)	72.5° 16:30	8.9	31%	8.0°
2032-03-17 Wed	20	—	unknown	20:05–20:45 (good, 0.67 h)	72.5° 16:25	8.85	41%	19.0°
2032-03-18 Thu	15	—	unknown	20:05–21:55 (marginal, 1.83 h)	72.5° 16:25	8.8	51%	30.9°
2032-03-19 Fri	12	—	unknown	20:10–21:45 (marginal, 1.58 h)	72.5° 16:20	8.75	60%	42.7°
2032-03-20 Sat	12	—	unknown	20:10–21:40 (marginal, 1.5 h)	72.5° 16:15	8.69	69%	54.5°
2032-03-21 Sun	11	—	unknown	20:10–21:35 (marginal, 1.42 h)	72.5° 16:10	8.64	78%	66.3°
2032-03-22 Mon	12	—	unknown	20:10–21:35 (marginal, 1.42 h)	72.5° 16:05	8.59	85%	78.0°
2032-03-23 Tue	13	—	unknown	20:15–21:35 (marginal, 1.33 h)	72.5° 16:05	8.54	91%	89.8°
2032-03-24 Wed	15	—	unknown	20:15–20:45 (good, 0.5 h)	72.5° 16:00	8.48	96%	101.7°
2032-03-25 Thu	18	—	unknown	20:15–20:50 (good, 0.58 h)	72.5° 15:55	8.43	99%	113.8°
2032-03-26 Fri	18	—	unknown	20:15–20:50 (good, 0.58 h)	72.5° 15:50	8.38	100%	126.0°
2032-03-27 Sat	17	—	unknown	20:20–20:50 (good, 0.5 h)	72.5° 15:45	8.32	99%	138.4°
2032-03-28 Sun	18	—	unknown	21:20–21:45 (good, 0.42 h)	72.5° 16:45	8.27	96%	150.9°
2032-03-29 Mon	18	—	unknown	21:20–21:50 (good, 0.5 h)	72.5° 16:40	8.22	92%	163.3°
2032-03-30 Tue	15	—	unknown	21:25–21:45 (good, 0.33 h)	72.5° 16:35	8.16	85%	173.6°
2032-03-31 Wed	13	—	unknown	21:25–21:40 (good, 0.25 h)	72.5° 16:30	8.11	76%	167.7°
2032-04-01 Thu	11	—	unknown	21:25–21:40 (good, 0.25 h)	72.5° 16:30	8.05	66%	155.0°
2032-04-02 Fri	10	—	unknown	21:25–21:35 (good, 0.17 h)	72.5° 16:25	8.0	56%	141.5°
2032-04-03 Sat	8	—	unknown	20:55–22:00 (marginal, 1.08 h)	72.5° 16:20	7.94	44%	127.7°
2032-04-04 Sun	7	—	unknown	21:30–21:55 (marginal, 0.42 h)	72.5° 16:15	7.89	33%	113.5°
2032-04-05 Mon	6	—	unknown	20:55–21:25 (marginal, 0.5 h)	72.5° 16:10	7.83	23%	99.2°
2032-04-06 Tue	5	—	unknown	20:55–21:20 (marginal, 0.42 h)	72.5° 16:10	7.77	14%	84.7°
2032-04-07 Wed	3	—	unknown	21:00–21:15 (marginal, 0.25 h)	72.5° 16:05	7.72	6%	70.2°
2032-04-08 Thu	3	—	unknown	21:00–21:10 (marginal, 0.17 h)	72.5° 16:00	7.66	2%	55.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-03-10&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.