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: 01-30 (100), 01-31 (100), 02-01 (100), 02-02 (100), 02-17 (98) — by astronomy; check the weather when the night is within four days.

2033-01-30astronomy score per night — click a bar for that night2033-02-28

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-01-30 Sun	100	—	unknown	19:10–00:40 (good, 5.5 h)	72.6° 19:30	10.81	0%	107.6°
2033-01-31 Mon	100	—	unknown	19:15–00:35 (good, 5.33 h)	72.6° 19:25	10.78	2%	92.8°
2033-02-01 Tue	100	—	unknown	19:15–00:30 (good, 5.25 h)	72.6° 19:20	10.75	6%	77.9°
2033-02-02 Wed	100	—	unknown	19:15–00:30 (good, 5.25 h)	72.6° 19:15	10.71	13%	63.1°
2033-02-03 Thu	92	—	unknown	19:15–00:25 (good, 5.17 h)	72.6° 19:15	10.68	22%	48.6°
2033-02-04 Fri	83	—	unknown	19:20–00:20 (good, 5.0 h)	72.6° 19:10	10.65	32%	34.5°
2033-02-05 Sat	69	—	unknown	19:20–23:55 (good, 4.58 h)	72.6° 19:05	10.61	43%	21.0°
2033-02-06 Sun	51	—	unknown	19:50–22:15 (good, 2.42 h)	72.6° 19:00	10.58	54%	9.4°
2033-02-07 Mon	35	—	unknown	19:20–00:25 (marginal, 5.08 h)	72.6° 18:55	10.54	65%	10.1°
2033-02-08 Tue	24	—	unknown	19:20–00:10 (marginal, 4.83 h)	72.6° 18:55	10.5	74%	21.3°
2033-02-09 Wed	20	—	unknown	19:25–23:50 (marginal, 4.42 h)	72.6° 18:50	10.47	82%	33.6°
2033-02-10 Thu	23	—	unknown	19:25–23:45 (marginal, 4.33 h)	72.6° 18:45	10.43	89%	45.9°
2033-02-11 Fri	30	—	unknown	19:25–23:45 (marginal, 4.33 h)	72.6° 18:40	10.39	95%	58.1°
2033-02-12 Sat	39	—	unknown	19:25–19:55 (good, 0.5 h)	72.6° 18:35	10.35	98%	70.2°
2033-02-13 Sun	51	—	unknown	19:30–21:30 (good, 2.0 h)	72.6° 18:35	10.31	100%	82.2°
2033-02-14 Mon	65	—	unknown	19:30–22:40 (good, 3.17 h)	72.6° 18:30	10.27	100%	94.1°
2033-02-15 Tue	78	—	unknown	19:30–23:15 (good, 3.75 h)	72.6° 18:25	10.23	98%	105.9°
2033-02-16 Wed	97	—	unknown	19:30–23:20 (good, 3.83 h)	72.6° 18:20	10.19	94%	117.6°
2033-02-17 Thu	98	—	unknown	19:35–23:20 (good, 3.75 h)	72.6° 18:20	10.15	88%	129.3°
2033-02-18 Fri	98	—	unknown	19:35–23:20 (good, 3.75 h)	72.6° 18:15	10.11	82%	141.0°
2033-02-19 Sat	98	—	unknown	19:35–23:15 (good, 3.67 h)	72.6° 18:10	10.07	74%	152.6°
2033-02-20 Sun	97	—	unknown	19:35–23:15 (good, 3.67 h)	72.6° 18:05	10.03	65%	163.9°
2033-02-21 Mon	95	—	unknown	19:35–23:15 (good, 3.67 h)	72.6° 18:00	9.99	56%	172.4°
2033-02-22 Tue	92	—	unknown	19:40–23:10 (good, 3.5 h)	72.6° 18:00	9.94	46%	167.2°
2033-02-23 Wed	91	—	unknown	19:40–23:05 (good, 3.42 h)	72.6° 17:55	9.9	35%	155.4°
2033-02-24 Thu	88	—	unknown	19:40–23:00 (good, 3.33 h)	72.6° 17:50	9.86	25%	142.4°
2033-02-25 Fri	86	—	unknown	19:40–22:55 (good, 3.25 h)	72.6° 17:45	9.81	16%	128.7°
2033-02-26 Sat	83	—	unknown	19:45–22:55 (good, 3.17 h)	72.6° 17:40	9.77	9%	114.4°
2033-02-27 Sun	81	—	unknown	19:45–22:50 (good, 3.08 h)	72.6° 17:40	9.72	3%	99.7°
2033-02-28 Mon	78	—	unknown	19:45–22:45 (good, 3.0 h)	72.6° 17:35	9.68	0%	84.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-01-30&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.