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: 03-04 (67), 03-05 (66), 03-06 (62), 03-07 (61), 03-08 (58) — by astronomy; check the weather when the night is within four days.

2048-03-04astronomy score per night — click a bar for that night2048-04-02

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2048-03-04 Wed	67	—	unknown	19:50–22:30 (good, 2.67 h)	72.6° 17:20	9.48	77%	162.2°
2048-03-05 Thu	66	—	unknown	19:50–22:25 (good, 2.58 h)	72.6° 17:15	9.43	67%	176.3°
2048-03-06 Fri	62	—	unknown	19:55–22:20 (good, 2.42 h)	72.6° 17:10	9.38	56%	169.2°
2048-03-07 Sat	61	—	unknown	19:55–22:15 (good, 2.33 h)	72.6° 17:05	9.34	44%	155.2°
2048-03-08 Sun	58	—	unknown	19:55–22:15 (good, 2.33 h)	72.6° 17:00	9.29	34%	141.2°
2048-03-09 Mon	56	—	unknown	19:55–22:10 (good, 2.25 h)	72.6° 17:00	9.24	23%	127.3°
2048-03-10 Tue	53	—	unknown	20:00–22:05 (good, 2.08 h)	72.6° 16:55	9.19	15%	113.6°
2048-03-11 Wed	51	—	unknown	20:00–22:00 (good, 2.0 h)	72.6° 16:50	9.14	8%	100.0°
2048-03-12 Thu	50	—	unknown	20:00–22:00 (good, 2.0 h)	72.6° 16:45	9.09	3%	86.7°
2048-03-13 Fri	47	—	unknown	20:00–21:55 (good, 1.92 h)	72.6° 16:45	9.04	1%	73.5°
2048-03-14 Sat	45	—	unknown	20:00–21:50 (good, 1.83 h)	72.6° 16:40	8.99	0%	60.6°
2048-03-15 Sun	43	—	unknown	20:05–21:45 (good, 1.67 h)	72.6° 16:35	8.94	2%	47.9°
2048-03-16 Mon	40	—	unknown	20:05–21:40 (good, 1.58 h)	72.6° 16:30	8.89	6%	35.5°
2048-03-17 Tue	35	—	unknown	20:05–21:35 (good, 1.5 h)	72.6° 16:25	8.84	11%	23.2°
2048-03-18 Wed	30	—	unknown	20:05–21:25 (good, 1.33 h)	72.6° 16:25	8.79	18%	11.3°
2048-03-19 Thu	25	—	unknown	20:10–21:15 (good, 1.08 h)	72.6° 16:20	8.74	25%	1.6°
2048-03-20 Fri	20	—	unknown	20:10–21:05 (good, 0.92 h)	72.6° 16:15	8.69	34%	12.6°
2048-03-21 Sat	15	—	unknown	20:10–21:50 (marginal, 1.67 h)	72.6° 16:10	8.64	43%	24.5°
2048-03-22 Sun	12	—	unknown	20:10–21:40 (marginal, 1.5 h)	72.6° 16:05	8.58	52%	36.4°
2048-03-23 Mon	10	—	unknown	20:15–21:30 (marginal, 1.25 h)	72.6° 16:05	8.53	62%	48.5°
2048-03-24 Tue	10	—	unknown	20:15–21:25 (marginal, 1.17 h)	72.6° 16:00	8.48	71%	60.8°
2048-03-25 Wed	10	—	unknown	20:15–21:25 (marginal, 1.17 h)	72.6° 15:55	8.42	80%	73.5°
2048-03-26 Thu	11	—	unknown	20:15–21:25 (marginal, 1.17 h)	72.6° 15:50	8.37	88%	86.6°
2048-03-27 Fri	12	—	unknown	20:20–20:35 (good, 0.25 h)	72.6° 15:50	8.32	94%	100.1°
2048-03-28 Sat	14	—	unknown	20:20–20:40 (good, 0.33 h)	72.6° 15:45	8.26	98%	114.0°
2048-03-29 Sun	15	—	unknown	21:20–21:40 (good, 0.33 h)	72.6° 16:40	8.21	100%	128.3°
2048-03-30 Mon	12	—	unknown	21:25–21:40 (good, 0.25 h)	72.6° 16:35	8.15	99%	142.8°
2048-03-31 Tue	13	—	unknown	21:25–21:45 (good, 0.33 h)	72.6° 16:30	8.1	95%	157.4°
2048-04-01 Wed	11	—	unknown	21:25–21:40 (good, 0.25 h)	72.6° 16:30	8.05	89%	172.1°
2048-04-02 Thu	10	—	unknown	21:25–21:35 (good, 0.17 h)	72.6° 16:25	7.99	80%	173.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2048-03-04&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.