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), 02-22 (22), 02-20 (21), 02-21 (21) — by astronomy; check the weather when the night is within four days.

2037-01-26astronomy score per night — click a bar for that night2037-02-24

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2037-01-26 Mon	8	—	unknown	19:10–19:50 (marginal, 0.67 h)	87.3° 12:55	10.93	73%	91.6°
2037-01-27 Tue	8	—	unknown	19:10–19:50 (marginal, 0.67 h)	87.3° 12:55	10.9	82%	98.4°
2037-01-28 Wed	8	—	unknown	19:10–19:45 (marginal, 0.58 h)	87.3° 12:50	10.87	90%	105.0°
2037-01-29 Thu	8	—	unknown	19:10–19:40 (marginal, 0.5 h)	87.3° 12:45	10.84	96%	111.0°
2037-01-30 Fri	8	—	unknown	19:10–19:35 (marginal, 0.42 h)	87.3° 12:40	10.81	99%	115.9°
2037-01-31 Sat	7	—	unknown	19:15–19:30 (marginal, 0.25 h)	87.3° 12:35	10.78	100%	119.1°
2037-02-01 Sun	7	—	unknown	05:40–06:00 (marginal, 0.33 h)	87.3° 12:35	10.75	97%	120.1°
2037-02-02 Mon	7	—	unknown	05:35–06:00 (marginal, 0.42 h)	87.3° 12:30	10.71	92%	118.8°
2037-02-03 Tue	7	—	unknown	05:30–06:00 (marginal, 0.5 h)	87.3° 12:25	10.68	84%	115.5°
2037-02-04 Wed	7	—	unknown	05:30–05:55 (marginal, 0.42 h)	87.3° 12:20	10.64	74%	110.6°
2037-02-05 Thu	7	—	unknown	05:25–05:55 (marginal, 0.5 h)	87.3° 12:20	10.61	64%	104.8°
2037-02-06 Fri	8	—	unknown	05:20–05:55 (marginal, 0.58 h)	87.3° 12:15	10.57	53%	98.4°
2037-02-07 Sat	8	—	unknown	05:15–05:55 (marginal, 0.67 h)	87.3° 12:10	10.54	43%	91.9°
2037-02-08 Sun	9	—	unknown	05:10–05:50 (marginal, 0.67 h)	87.3° 12:05	10.5	33%	85.4°
2037-02-09 Mon	9	—	unknown	05:10–06:25 (marginal, 1.25 h)	87.3° 12:00	10.46	24%	79.3°
2037-02-10 Tue	11	—	unknown	05:45–05:50 (good, 0.08 h)	87.3° 11:55	10.43	16%	73.7°
2037-02-11 Wed	12	—	unknown	05:35–05:50 (good, 0.25 h)	87.3° 11:50	10.39	9%	68.7°
2037-02-12 Thu	14	—	unknown	05:30–05:50 (good, 0.33 h)	87.3° 11:45	10.35	4%	64.7°
2037-02-13 Fri	14	—	unknown	05:25–05:45 (good, 0.33 h)	87.3° 11:40	10.31	1%	61.8°
2037-02-14 Sat	15	—	unknown	05:25–05:45 (good, 0.33 h)	87.3° 11:40	10.27	0%	60.2°
2037-02-15 Sun	16	—	unknown	05:20–05:45 (good, 0.42 h)	87.3° 11:35	10.23	0%	60.0°
2037-02-16 Mon	17	—	unknown	05:15–05:45 (good, 0.5 h)	87.3° 11:30	10.19	3%	61.1°
2037-02-17 Tue	17	—	unknown	05:10–05:40 (good, 0.5 h)	87.3° 11:25	10.15	7%	63.6°
2037-02-18 Wed	19	—	unknown	05:10–05:40 (good, 0.5 h)	87.3° 11:25	10.11	12%	67.2°
2037-02-19 Thu	20	—	unknown	05:05–05:40 (good, 0.58 h)	87.3° 11:20	10.07	19%	71.8°
2037-02-20 Fri	21	—	unknown	05:00–05:40 (good, 0.67 h)	87.3° 11:15	10.03	27%	77.1°
2037-02-21 Sat	21	—	unknown	04:55–05:35 (good, 0.67 h)	87.3° 11:10	9.98	36%	83.0°
2037-02-22 Sun	22	—	unknown	04:50–05:35 (good, 0.75 h)	87.3° 11:05	9.94	46%	89.3°
2037-02-23 Mon	23	—	unknown	04:50–05:35 (good, 0.75 h)	87.3° 11:05	9.9	57%	95.9°
2037-02-24 Tue	23	—	unknown	04:45–05:30 (good, 0.75 h)	87.3° 11:00	9.86	68%	102.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2037-01-26&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.