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 Triangulum Pinwheel: 02-06 (78), 02-07 (76), 02-08 (74), 02-09 (71), 02-10 (69) — by astronomy; check the weather when the night is within four days.

2029-02-06astronomy score per night — click a bar for that night2029-03-07

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-02-06 Tue	78	—	unknown	19:20–22:20 (good, 3.0 h)	79.1° 16:50	10.58	39%	148.1°
2029-02-07 Wed	76	—	unknown	19:20–22:15 (good, 2.92 h)	79.1° 16:45	10.54	28%	135.9°
2029-02-08 Thu	74	—	unknown	19:20–22:15 (good, 2.92 h)	79.1° 16:40	10.5	19%	123.4°
2029-02-09 Fri	71	—	unknown	19:25–22:10 (good, 2.75 h)	79.1° 16:35	10.47	12%	110.9°
2029-02-10 Sat	69	—	unknown	19:25–22:05 (good, 2.67 h)	79.1° 16:35	10.43	6%	98.5°
2029-02-11 Sun	66	—	unknown	19:25–22:00 (good, 2.58 h)	79.1° 16:30	10.39	2%	86.3°
2029-02-12 Mon	64	—	unknown	19:25–21:55 (good, 2.5 h)	79.1° 16:25	10.35	0%	74.3°
2029-02-13 Tue	61	—	unknown	19:30–21:55 (good, 2.42 h)	79.1° 16:20	10.31	0%	62.5°
2029-02-14 Wed	59	—	unknown	19:30–21:50 (good, 2.33 h)	79.1° 16:15	10.27	2%	50.9°
2029-02-15 Thu	55	—	unknown	19:30–21:45 (good, 2.25 h)	79.1° 16:15	10.23	6%	39.7°
2029-02-16 Fri	50	—	unknown	19:30–21:40 (good, 2.17 h)	79.1° 16:10	10.19	11%	29.1°
2029-02-17 Sat	42	—	unknown	19:35–21:30 (good, 1.92 h)	79.1° 16:05	10.15	18%	19.9°
2029-02-18 Sun	35	—	unknown	19:35–21:20 (good, 1.75 h)	79.1° 16:00	10.11	25%	14.7°
2029-02-19 Mon	29	—	unknown	19:35–21:10 (good, 1.58 h)	79.1° 15:55	10.07	34%	17.6°
2029-02-20 Tue	22	—	unknown	19:35–19:55 (good, 0.33 h)	79.1° 15:55	10.03	43%	26.2°
2029-02-21 Wed	17	—	unknown	19:35–21:40 (marginal, 2.08 h)	79.1° 15:50	9.99	53%	36.9°
2029-02-22 Thu	15	—	unknown	19:40–21:35 (marginal, 1.92 h)	79.1° 15:45	9.94	63%	48.5°
2029-02-23 Fri	14	—	unknown	19:40–21:30 (marginal, 1.83 h)	79.1° 15:40	9.9	73%	60.9°
2029-02-24 Sat	15	—	unknown	19:40–21:25 (marginal, 1.75 h)	79.1° 15:40	9.86	82%	73.8°
2029-02-25 Sun	17	—	unknown	19:40–21:25 (marginal, 1.75 h)	79.1° 15:35	9.81	89%	87.2°
2029-02-26 Mon	19	—	unknown	19:45–20:35 (good, 0.83 h)	79.1° 15:30	9.77	95%	101.1°
2029-02-27 Tue	23	—	unknown	19:45–20:45 (good, 1.0 h)	79.1° 15:25	9.72	99%	115.3°
2029-02-28 Wed	24	—	unknown	19:45–20:45 (good, 1.0 h)	79.1° 15:20	9.68	100%	129.6°
2029-03-01 Thu	25	—	unknown	19:45–20:40 (good, 0.92 h)	79.1° 15:20	9.63	98%	143.6°
2029-03-02 Fri	26	—	unknown	19:50–20:45 (good, 0.92 h)	79.1° 15:15	9.59	92%	156.5°
2029-03-03 Sat	25	—	unknown	19:50–20:40 (good, 0.83 h)	79.1° 15:10	9.54	85%	164.9°
2029-03-04 Sun	23	—	unknown	19:50–20:40 (good, 0.83 h)	79.1° 15:05	9.5	76%	161.8°
2029-03-05 Mon	22	—	unknown	19:50–20:35 (good, 0.75 h)	79.1° 15:00	9.45	65%	151.1°
2029-03-06 Tue	21	—	unknown	19:50–20:30 (good, 0.67 h)	79.1° 15:00	9.4	54%	138.8°
2029-03-07 Wed	18	—	unknown	19:55–20:25 (good, 0.5 h)	79.1° 14:55	9.35	44%	126.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-02-06&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.