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: 02-27 (26), 02-28 (26), 03-01 (26), 02-25 (25), 02-26 (25) — by astronomy; check the weather when the night is within four days.

2034-02-04astronomy score per night — click a bar for that night2034-03-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-02-04 Sat	7	—	unknown	05:30–05:55 (marginal, 0.42 h)	87.3° 12:25	10.65	98%	125.0°
2034-02-05 Sun	8	—	unknown	05:25–05:55 (marginal, 0.5 h)	87.3° 12:20	10.62	94%	123.8°
2034-02-06 Mon	8	—	unknown	05:20–05:55 (marginal, 0.58 h)	87.3° 12:15	10.58	88%	120.9°
2034-02-07 Tue	8	—	unknown	05:15–05:55 (marginal, 0.67 h)	87.3° 12:10	10.55	81%	116.7°
2034-02-08 Wed	8	—	unknown	05:15–05:55 (marginal, 0.67 h)	87.3° 12:05	10.51	73%	111.4°
2034-02-09 Thu	8	—	unknown	05:10–05:50 (marginal, 0.67 h)	87.3° 12:00	10.47	64%	105.5°
2034-02-10 Fri	9	—	unknown	05:05–05:50 (marginal, 0.75 h)	87.3° 11:55	10.44	55%	99.0°
2034-02-11 Sat	10	—	unknown	05:00–06:20 (marginal, 1.33 h)	87.3° 11:50	10.4	46%	92.3°
2034-02-12 Sun	11	—	unknown	05:45–05:50 (good, 0.08 h)	87.3° 11:45	10.36	36%	85.4°
2034-02-13 Mon	11	—	unknown	05:35–05:45 (good, 0.17 h)	87.3° 11:45	10.32	27%	78.5°
2034-02-14 Tue	13	—	unknown	05:30–05:45 (good, 0.25 h)	87.3° 11:40	10.28	18%	71.8°
2034-02-15 Wed	15	—	unknown	05:25–05:45 (good, 0.33 h)	87.3° 11:35	10.24	11%	65.6°
2034-02-16 Thu	17	—	unknown	05:15–05:45 (good, 0.5 h)	87.3° 11:30	10.2	5%	60.4°
2034-02-17 Fri	17	—	unknown	05:15–05:40 (good, 0.42 h)	87.3° 11:25	10.16	2%	56.7°
2034-02-18 Sat	18	—	unknown	05:10–05:40 (good, 0.5 h)	87.3° 11:25	10.12	0%	55.1°
2034-02-19 Sun	20	—	unknown	05:05–05:40 (good, 0.58 h)	87.3° 11:20	10.08	1%	55.9°
2034-02-20 Mon	21	—	unknown	05:00–05:40 (good, 0.67 h)	87.3° 11:15	10.04	5%	59.1°
2034-02-21 Tue	21	—	unknown	04:55–05:35 (good, 0.67 h)	87.3° 11:10	10.0	12%	64.4°
2034-02-22 Wed	21	—	unknown	04:55–05:35 (good, 0.67 h)	87.3° 11:10	9.95	20%	71.1°
2034-02-23 Thu	23	—	unknown	04:50–05:35 (good, 0.75 h)	87.3° 11:05	9.91	30%	78.7°
2034-02-24 Fri	23	—	unknown	04:45–05:30 (good, 0.75 h)	87.3° 11:00	9.87	42%	86.7°
2034-02-25 Sat	25	—	unknown	04:40–05:30 (good, 0.83 h)	87.3° 10:55	9.82	53%	94.7°
2034-02-26 Sun	25	—	unknown	04:35–05:30 (good, 0.92 h)	87.3° 10:50	9.78	64%	102.4°
2034-02-27 Mon	26	—	unknown	04:35–05:30 (good, 0.92 h)	87.3° 10:50	9.73	74%	109.5°
2034-02-28 Tue	26	—	unknown	04:30–05:25 (good, 0.92 h)	87.3° 10:45	9.69	83%	115.6°
2034-03-01 Wed	26	—	unknown	04:35–05:25 (good, 0.83 h)	87.3° 10:40	9.64	90%	120.4°
2034-03-02 Thu	24	—	unknown	04:30–05:25 (good, 0.92 h)	87.3° 10:35	9.6	95%	123.6°
2034-03-03 Fri	23	—	unknown	04:30–05:20 (good, 0.83 h)	87.3° 10:30	9.55	99%	124.9°
2034-03-04 Sat	23	—	unknown	04:25–05:20 (good, 0.92 h)	87.3° 10:30	9.51	100%	124.3°
2034-03-05 Sun	24	—	unknown	04:25–05:20 (good, 0.92 h)	87.3° 10:25	9.46	99%	122.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-02-04&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.