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: 10-16 (100), 10-17 (100), 10-18 (100), 10-19 (100), 10-20 (100) — by astronomy; check the weather when the night is within four days.

2033-10-16astronomy score per night — click a bar for that night2033-11-14

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-10-16 Sun	100	—	unknown	20:15–02:55 (good, 6.67 h)	87.3° 20:40	9.88	33%	123.4°
2033-10-17 Mon	100	—	unknown	20:10–02:55 (good, 6.75 h)	87.3° 20:35	9.92	24%	125.4°
2033-10-18 Tue	100	—	unknown	20:10–02:50 (good, 6.67 h)	87.3° 20:30	9.96	16%	125.5°
2033-10-19 Wed	100	—	unknown	20:10–02:45 (good, 6.58 h)	87.3° 20:25	10.0	10%	123.9°
2033-10-20 Thu	100	—	unknown	20:05–02:45 (good, 6.67 h)	87.3° 20:25	10.05	5%	120.7°
2033-10-21 Fri	100	—	unknown	20:05–02:40 (good, 6.58 h)	87.3° 20:20	10.09	2%	116.3°
2033-10-22 Sat	100	—	unknown	20:05–02:35 (good, 6.5 h)	87.3° 20:15	10.13	0%	110.8°
2033-10-23 Sun	100	—	unknown	20:05–02:30 (good, 6.42 h)	87.3° 20:10	10.17	0%	104.6°
2033-10-24 Mon	100	—	unknown	20:00–02:25 (good, 6.42 h)	87.3° 20:05	10.21	2%	97.9°
2033-10-25 Tue	100	—	unknown	20:00–02:25 (good, 6.42 h)	87.3° 20:05	10.25	6%	91.0°
2033-10-26 Wed	100	—	unknown	20:00–02:20 (good, 6.33 h)	87.3° 20:00	10.29	12%	83.9°
2033-10-27 Thu	100	—	unknown	20:00–02:15 (good, 6.25 h)	87.3° 19:55	10.33	19%	77.0°
2033-10-28 Fri	100	—	unknown	19:55–02:10 (good, 6.25 h)	87.3° 19:50	10.36	27%	70.3°
2033-10-29 Sat	96	—	unknown	19:55–02:10 (good, 6.25 h)	87.3° 19:50	10.4	37%	64.3°
2033-10-30 Sun	89	—	unknown	18:55–01:05 (good, 6.17 h)	87.3° 18:45	10.44	47%	59.3°
2033-10-31 Mon	81	—	unknown	18:55–01:00 (good, 6.08 h)	87.3° 18:40	10.48	58%	55.8°
2033-11-01 Tue	66	—	unknown	18:50–00:20 (good, 5.5 h)	87.3° 18:35	10.51	69%	54.4°
2033-11-02 Wed	58	—	unknown	18:50–19:10 (good, 0.33 h)	87.3° 18:30	10.55	79%	55.4°
2033-11-03 Thu	51	—	unknown	18:50–01:10 (marginal, 6.33 h)	87.3° 18:30	10.58	88%	58.8°
2033-11-04 Fri	51	—	unknown	18:50–18:55 (good, 0.08 h)	87.3° 18:25	10.62	94%	64.5°
2033-11-05 Sat	56	—	unknown	18:50–20:05 (good, 1.25 h)	87.3° 18:20	10.65	99%	71.7°
2033-11-06 Sun	68	—	unknown	18:45–21:30 (good, 2.75 h)	87.3° 18:15	10.69	100%	80.0°
2033-11-07 Mon	79	—	unknown	18:45–22:35 (good, 3.83 h)	87.3° 18:10	10.72	98%	88.6°
2033-11-08 Tue	100	—	unknown	18:45–23:40 (good, 4.92 h)	87.3° 18:10	10.75	94%	97.2°
2033-11-09 Wed	100	—	unknown	18:45–00:00 (good, 5.25 h)	87.3° 18:05	10.79	87%	105.2°
2033-11-10 Thu	100	—	unknown	18:45–00:05 (good, 5.33 h)	87.3° 18:00	10.82	79%	112.3°
2033-11-11 Fri	100	—	unknown	18:40–00:05 (good, 5.42 h)	87.3° 17:55	10.85	69%	118.1°
2033-11-12 Sat	100	—	unknown	18:40–00:05 (good, 5.42 h)	87.3° 17:55	10.88	59%	122.4°
2033-11-13 Sun	100	—	unknown	18:40–00:05 (good, 5.42 h)	87.3° 17:50	10.91	49%	124.9°
2033-11-14 Mon	100	—	unknown	18:40–00:05 (good, 5.42 h)	87.3° 17:45	10.94	40%	125.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-10-16&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.