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: 02-22 (20), 01-24 (18), 02-21 (18), 01-25 (16), 02-20 (16) — by astronomy; check the weather when the night is within four days.

2036-01-24astronomy score per night — click a bar for that night2036-02-22

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-01-24 Thu	18	—	unknown	19:05–19:30 (good, 0.42 h)	87.3° 13:10	11.01	11%	76.9°
2036-01-25 Fri	16	—	unknown	19:05–19:25 (good, 0.33 h)	87.3° 13:05	10.98	6%	71.4°
2036-01-26 Sat	15	—	unknown	19:05–19:20 (good, 0.25 h)	87.3° 13:00	10.96	2%	66.5°
2036-01-27 Sun	13	—	unknown	19:10–19:15 (good, 0.08 h)	87.3° 12:55	10.93	0%	62.6°
2036-01-28 Mon	12	—	unknown	18:35–19:45 (marginal, 1.17 h)	87.3° 12:50	10.9	0%	59.8°
2036-01-29 Tue	11	—	unknown	18:40–19:45 (marginal, 1.08 h)	87.3° 12:50	10.87	2%	58.4°
2036-01-30 Wed	10	—	unknown	19:10–19:40 (marginal, 0.5 h)	87.3° 12:45	10.84	6%	58.5°
2036-01-31 Thu	9	—	unknown	19:15–19:35 (marginal, 0.33 h)	87.3° 12:40	10.8	11%	60.2°
2036-02-01 Fri	8	—	unknown	05:45–06:00 (marginal, 0.25 h)	87.3° 12:35	10.77	18%	63.4°
2036-02-02 Sat	8	—	unknown	05:40–06:00 (marginal, 0.33 h)	87.3° 12:30	10.74	26%	67.9°
2036-02-03 Sun	9	—	unknown	05:35–06:00 (marginal, 0.42 h)	87.3° 12:30	10.7	36%	73.4°
2036-02-04 Mon	8	—	unknown	05:30–05:55 (marginal, 0.42 h)	87.3° 12:25	10.67	46%	79.8°
2036-02-05 Tue	9	—	unknown	05:25–05:55 (marginal, 0.5 h)	87.3° 12:20	10.64	57%	86.7°
2036-02-06 Wed	9	—	unknown	05:25–05:55 (marginal, 0.5 h)	87.3° 12:15	10.6	68%	94.0°
2036-02-07 Thu	9	—	unknown	05:20–06:25 (marginal, 1.08 h)	87.3° 12:15	10.57	78%	101.4°
2036-02-08 Fri	10	—	unknown	05:50–05:55 (good, 0.08 h)	87.3° 12:10	10.53	87%	108.3°
2036-02-09 Sat	9	—	unknown	05:10–05:50 (marginal, 0.67 h)	87.3° 12:05	10.49	94%	114.4°
2036-02-10 Sun	9	—	unknown	05:05–05:50 (marginal, 0.75 h)	87.3° 12:00	10.46	98%	118.9°
2036-02-11 Mon	9	—	unknown	05:05–06:20 (marginal, 1.25 h)	87.3° 11:55	10.42	100%	121.4°
2036-02-12 Tue	10	—	unknown	05:45–05:50 (good, 0.08 h)	87.3° 11:50	10.38	98%	121.5°
2036-02-13 Wed	11	—	unknown	05:45–05:50 (good, 0.08 h)	87.3° 11:45	10.34	94%	119.3°
2036-02-14 Thu	11	—	unknown	05:40–05:45 (good, 0.08 h)	87.3° 11:40	10.3	88%	115.2°
2036-02-15 Fri	11	—	unknown	05:40–05:45 (good, 0.08 h)	87.3° 11:35	10.26	80%	109.9°
2036-02-16 Sat	11	—	unknown	05:35–05:45 (good, 0.17 h)	87.3° 11:35	10.22	70%	103.9°
2036-02-17 Sun	13	—	unknown	05:35–05:45 (good, 0.17 h)	87.3° 11:30	10.18	60%	97.5°
2036-02-18 Mon	13	—	unknown	05:25–05:40 (good, 0.25 h)	87.3° 11:25	10.14	50%	91.0°
2036-02-19 Tue	15	—	unknown	05:20–05:40 (good, 0.33 h)	87.3° 11:20	10.1	41%	84.6°
2036-02-20 Wed	16	—	unknown	05:15–05:40 (good, 0.42 h)	87.3° 11:20	10.06	32%	78.5°
2036-02-21 Thu	18	—	unknown	05:05–05:35 (good, 0.5 h)	87.3° 11:15	10.02	23%	72.8°
2036-02-22 Fri	20	—	unknown	05:00–05:35 (good, 0.58 h)	87.3° 11:10	9.97	16%	67.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-01-24&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.