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: 03-14 (47), 03-15 (43), 03-16 (42), 03-17 (40), 03-18 (38) — by astronomy; check the weather when the night is within four days.

2034-03-14astronomy score per night — click a bar for that night2034-04-12

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-03-14 Tue	47	—	unknown	20:00–21:50 (good, 1.83 h)	72.5° 16:40	9.02	34%	135.4°
2034-03-15 Wed	43	—	unknown	20:05–21:45 (good, 1.67 h)	72.5° 16:35	8.97	24%	122.6°
2034-03-16 Thu	42	—	unknown	20:05–21:45 (good, 1.67 h)	72.5° 16:30	8.92	16%	109.4°
2034-03-17 Fri	40	—	unknown	20:05–21:40 (good, 1.58 h)	72.5° 16:30	8.87	8%	95.7°
2034-03-18 Sat	38	—	unknown	20:05–21:35 (good, 1.5 h)	72.5° 16:25	8.82	3%	81.6°
2034-03-19 Sun	36	—	unknown	20:10–21:30 (good, 1.33 h)	72.5° 16:20	8.77	0%	67.1°
2034-03-20 Mon	34	—	unknown	20:10–21:30 (good, 1.33 h)	72.5° 16:15	8.72	0%	52.4°
2034-03-21 Tue	32	—	unknown	20:10–21:25 (good, 1.25 h)	72.5° 16:15	8.67	3%	37.8°
2034-03-22 Wed	28	—	unknown	20:10–21:20 (good, 1.17 h)	72.5° 16:10	8.61	9%	23.5°
2034-03-23 Thu	23	—	unknown	20:15–21:10 (good, 0.92 h)	72.5° 16:05	8.56	17%	11.1°
2034-03-24 Fri	19	—	unknown	20:15–20:55 (good, 0.67 h)	72.5° 16:00	8.51	27%	11.3°
2034-03-25 Sat	14	—	unknown	20:15–20:40 (good, 0.42 h)	72.5° 15:55	8.46	38%	23.1°
2034-03-26 Sun	10	—	unknown	21:15–22:25 (marginal, 1.17 h)	72.5° 16:55	8.4	49%	36.2°
2034-03-27 Mon	8	—	unknown	21:20–22:20 (marginal, 1.0 h)	72.5° 16:50	8.35	60%	49.4°
2034-03-28 Tue	8	—	unknown	21:20–22:15 (marginal, 0.92 h)	72.5° 16:45	8.3	70%	62.3°
2034-03-29 Wed	8	—	unknown	21:20–22:10 (marginal, 0.83 h)	72.5° 16:40	8.24	79%	75.0°
2034-03-30 Thu	8	—	unknown	21:20–22:10 (marginal, 0.83 h)	72.5° 16:35	8.19	86%	87.5°
2034-03-31 Fri	8	—	unknown	21:25–22:10 (marginal, 0.75 h)	72.5° 16:35	8.13	92%	99.8°
2034-04-01 Sat	9	—	unknown	20:50–22:10 (marginal, 1.33 h)	72.5° 16:30	8.08	97%	111.9°
2034-04-02 Sun	8	—	unknown	20:50–22:05 (marginal, 1.25 h)	72.5° 16:25	8.02	99%	123.8°
2034-04-03 Mon	7	—	unknown	20:55–22:00 (marginal, 1.08 h)	72.5° 16:20	7.97	100%	135.6°
2034-04-04 Tue	6	—	unknown	21:30–21:55 (marginal, 0.42 h)	72.5° 16:20	7.91	99%	147.2°
2034-04-05 Wed	6	—	unknown	20:55–21:25 (marginal, 0.5 h)	72.5° 16:15	7.86	96%	158.4°
2034-04-06 Thu	5	—	unknown	21:30–21:50 (marginal, 0.33 h)	72.5° 16:10	7.8	91%	168.2°
2034-04-07 Fri	4	—	unknown	21:00–21:15 (marginal, 0.25 h)	72.5° 16:05	7.75	85%	170.7°
2034-04-08 Sat	3	—	unknown	21:00–21:15 (marginal, 0.25 h)	72.5° 16:00	7.69	78%	162.3°
2034-04-09 Sun	2	—	unknown	21:00–21:10 (marginal, 0.17 h)	72.5° 16:00	7.63	70%	151.2°
2034-04-10 Mon	2	—	unknown	21:00–21:05 (marginal, 0.08 h)	72.5° 15:55	7.58	60%	139.4°
2034-04-11 Tue	1	—	unknown	—	72.5° 15:50	7.52	50%	127.1°
2034-04-12 Wed	1	—	unknown	—	72.5° 15:45	7.46	40%	114.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-03-14&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.