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: 02-17 (17), 02-16 (16), 01-19 (14), 02-13 (14), 02-14 (14) — by astronomy; check the weather when the night is within four days.

2032-01-19astronomy score per night — click a bar for that night2032-02-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-01-19 Mon	14	—	unknown	19:00–19:05 (good, 0.08 h)	87.3° 13:25	11.14	55%	71.2°
2032-01-20 Tue	13	—	unknown	19:00–20:15 (marginal, 1.25 h)	87.3° 13:25	11.12	65%	78.4°
2032-01-21 Wed	12	—	unknown	19:00–20:10 (marginal, 1.17 h)	87.3° 13:20	11.09	74%	85.9°
2032-01-22 Thu	12	—	unknown	19:05–20:10 (marginal, 1.08 h)	87.3° 13:15	11.07	82%	93.3°
2032-01-23 Fri	12	—	unknown	19:05–20:05 (marginal, 1.0 h)	87.3° 13:10	11.04	89%	100.6°
2032-01-24 Sat	12	—	unknown	18:30–20:00 (marginal, 1.5 h)	87.3° 13:10	11.01	94%	107.4°
2032-01-25 Sun	12	—	unknown	18:35–20:00 (marginal, 1.42 h)	87.3° 13:05	10.99	98%	113.7°
2032-01-26 Mon	12	—	unknown	18:35–19:55 (marginal, 1.33 h)	87.3° 13:00	10.96	100%	119.1°
2032-01-27 Tue	11	—	unknown	19:10–19:50 (marginal, 0.67 h)	87.3° 12:55	10.93	100%	123.3°
2032-01-28 Wed	10	—	unknown	19:10–19:45 (marginal, 0.58 h)	87.3° 12:50	10.9	98%	126.1°
2032-01-29 Thu	11	—	unknown	18:40–19:45 (marginal, 1.08 h)	87.3° 12:50	10.87	95%	127.2°
2032-01-30 Fri	10	—	unknown	19:10–19:40 (marginal, 0.5 h)	87.3° 12:45	10.84	90%	126.4°
2032-01-31 Sat	9	—	unknown	19:15–19:35 (marginal, 0.33 h)	87.3° 12:40	10.8	83%	123.8°
2032-02-01 Sun	8	—	unknown	19:15–19:30 (marginal, 0.25 h)	87.3° 12:35	10.77	76%	119.5°
2032-02-02 Mon	7	—	unknown	05:40–06:00 (marginal, 0.33 h)	87.3° 12:30	10.74	66%	114.0°
2032-02-03 Tue	8	—	unknown	05:35–06:00 (marginal, 0.42 h)	87.3° 12:30	10.71	57%	107.3°
2032-02-04 Wed	7	—	unknown	05:30–05:55 (marginal, 0.42 h)	87.3° 12:25	10.67	46%	99.8°
2032-02-05 Thu	8	—	unknown	05:25–05:55 (marginal, 0.5 h)	87.3° 12:20	10.64	36%	91.8°
2032-02-06 Fri	8	—	unknown	05:25–05:55 (marginal, 0.5 h)	87.3° 12:15	10.6	25%	83.4°
2032-02-07 Sat	9	—	unknown	05:20–05:55 (marginal, 0.58 h)	87.3° 12:15	10.57	16%	75.0°
2032-02-08 Sun	10	—	unknown	05:50–05:55 (good, 0.08 h)	87.3° 12:10	10.53	8%	67.0°
2032-02-09 Mon	11	—	unknown	05:45–05:50 (good, 0.08 h)	87.3° 12:05	10.49	3%	60.2°
2032-02-10 Tue	11	—	unknown	05:40–05:50 (good, 0.17 h)	87.3° 12:00	10.46	0%	55.3°
2032-02-11 Wed	11	—	unknown	05:40–05:50 (good, 0.17 h)	87.3° 11:55	10.42	1%	53.0°
2032-02-12 Thu	13	—	unknown	05:35–05:50 (good, 0.25 h)	87.3° 11:50	10.38	4%	53.7°
2032-02-13 Fri	14	—	unknown	05:30–05:50 (good, 0.33 h)	87.3° 11:45	10.34	10%	57.1°
2032-02-14 Sat	14	—	unknown	05:25–05:45 (good, 0.33 h)	87.3° 11:40	10.3	18%	62.5°
2032-02-15 Sun	14	—	unknown	05:25–05:45 (good, 0.33 h)	87.3° 11:35	10.26	28%	69.2°
2032-02-16 Mon	16	—	unknown	05:20–05:45 (good, 0.42 h)	87.3° 11:35	10.22	38%	76.5°
2032-02-17 Tue	17	—	unknown	05:15–05:45 (good, 0.5 h)	87.3° 11:30	10.18	48%	84.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-01-19&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.