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 V1057 Cyg: 02-23 (23), 02-24 (23), 02-25 (23), 02-22 (22), 02-26 (22) — by astronomy; check the weather when the night is within four days.

2029-01-29astronomy score per night — click a bar for that night2029-02-27

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-01-29 Mon	8	—	unknown	19:10–19:40 (marginal, 0.5 h)	87.3° 12:45	10.84	100%	118.6°
2029-01-30 Tue	8	—	unknown	19:10–19:35 (marginal, 0.42 h)	87.3° 12:40	10.81	99%	123.7°
2029-01-31 Wed	8	—	unknown	19:15–19:30 (marginal, 0.25 h)	87.3° 12:35	10.78	96%	126.6°
2029-02-01 Thu	8	—	unknown	05:40–06:00 (marginal, 0.33 h)	87.3° 12:35	10.75	90%	126.7°
2029-02-02 Fri	8	—	unknown	05:35–06:00 (marginal, 0.42 h)	87.3° 12:30	10.71	82%	124.0°
2029-02-03 Sat	8	—	unknown	05:30–06:00 (marginal, 0.5 h)	87.3° 12:25	10.68	72%	119.1°
2029-02-04 Sun	7	—	unknown	05:30–05:55 (marginal, 0.42 h)	87.3° 12:20	10.65	61%	112.6°
2029-02-05 Mon	8	—	unknown	05:25–05:55 (marginal, 0.5 h)	87.3° 12:20	10.61	50%	105.1°
2029-02-06 Tue	8	—	unknown	05:20–05:55 (marginal, 0.58 h)	87.3° 12:15	10.58	39%	97.2°
2029-02-07 Wed	9	—	unknown	05:15–05:55 (marginal, 0.67 h)	87.3° 12:10	10.54	28%	89.1°
2029-02-08 Thu	10	—	unknown	05:50–05:55 (good, 0.08 h)	87.3° 12:05	10.5	19%	81.2°
2029-02-09 Fri	10	—	unknown	05:45–05:50 (good, 0.08 h)	87.3° 12:00	10.47	12%	73.8°
2029-02-10 Sat	12	—	unknown	05:40–05:50 (good, 0.17 h)	87.3° 11:55	10.43	6%	67.0°
2029-02-11 Sun	13	—	unknown	05:35–05:50 (good, 0.25 h)	87.3° 11:50	10.39	2%	61.2°
2029-02-12 Mon	14	—	unknown	05:30–05:50 (good, 0.33 h)	87.3° 11:45	10.35	0%	56.8°
2029-02-13 Tue	14	—	unknown	05:25–05:45 (good, 0.33 h)	87.3° 11:40	10.31	0%	54.0°
2029-02-14 Wed	15	—	unknown	05:25–05:45 (good, 0.33 h)	87.3° 11:40	10.27	2%	53.1°
2029-02-15 Thu	16	—	unknown	05:20–05:45 (good, 0.42 h)	87.3° 11:35	10.23	6%	54.0°
2029-02-16 Fri	17	—	unknown	05:15–05:45 (good, 0.5 h)	87.3° 11:30	10.19	11%	56.7°
2029-02-17 Sat	17	—	unknown	05:10–05:40 (good, 0.5 h)	87.3° 11:25	10.15	18%	60.8°
2029-02-18 Sun	19	—	unknown	05:10–05:40 (good, 0.5 h)	87.3° 11:25	10.11	25%	66.1°
2029-02-19 Mon	20	—	unknown	05:05–05:40 (good, 0.58 h)	87.3° 11:20	10.07	34%	72.2°
2029-02-20 Tue	21	—	unknown	05:00–05:40 (good, 0.67 h)	87.3° 11:15	10.03	43%	79.0°
2029-02-21 Wed	21	—	unknown	04:55–05:35 (good, 0.67 h)	87.3° 11:10	9.99	53%	86.2°
2029-02-22 Thu	22	—	unknown	04:50–05:35 (good, 0.75 h)	87.3° 11:05	9.94	63%	93.8°
2029-02-23 Fri	23	—	unknown	04:50–05:35 (good, 0.75 h)	87.3° 11:05	9.9	73%	101.4°
2029-02-24 Sat	23	—	unknown	04:45–05:30 (good, 0.75 h)	87.3° 11:00	9.86	82%	108.9°
2029-02-25 Sun	23	—	unknown	04:50–05:30 (good, 0.67 h)	87.3° 10:55	9.81	89%	115.9°
2029-02-26 Mon	22	—	unknown	04:45–05:30 (good, 0.75 h)	87.3° 10:50	9.77	95%	121.7°
2029-02-27 Tue	22	—	unknown	04:45–05:30 (good, 0.75 h)	87.3° 10:45	9.72	99%	125.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-01-29&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.