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: 01-04 (43), 01-05 (37), 01-06 (30), 01-18 (26), 01-07 (25) — by astronomy; check the weather when the night is within four days.

2033-01-04astronomy score per night — click a bar for that night2033-02-02

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-01-04 Tue	43	—	unknown	18:45–20:35 (good, 1.83 h)	87.3° 14:25	11.41	16%	53.6°
2033-01-05 Wed	37	—	unknown	18:45–20:30 (good, 1.75 h)	87.3° 14:20	11.4	26%	54.5°
2033-01-06 Thu	30	—	unknown	18:50–20:15 (good, 1.42 h)	87.3° 14:15	11.38	36%	57.8°
2033-01-07 Fri	25	—	unknown	18:50–20:00 (good, 1.17 h)	87.3° 14:10	11.37	48%	63.1°
2033-01-08 Sat	21	—	unknown	18:50–19:25 (good, 0.58 h)	87.3° 14:10	11.35	59%	69.8°
2033-01-09 Sun	20	—	unknown	18:50–18:55 (good, 0.08 h)	87.3° 14:05	11.34	69%	77.2°
2033-01-10 Mon	19	—	unknown	18:50–18:55 (good, 0.08 h)	87.3° 14:00	11.32	79%	85.0°
2033-01-11 Tue	19	—	unknown	18:55–19:15 (good, 0.33 h)	87.3° 13:55	11.3	87%	92.8°
2033-01-12 Wed	20	—	unknown	18:55–19:40 (good, 0.75 h)	87.3° 13:50	11.28	93%	100.5°
2033-01-13 Thu	22	—	unknown	18:55–19:45 (good, 0.83 h)	87.3° 13:50	11.26	97%	107.6°
2033-01-14 Fri	23	—	unknown	18:55–19:45 (good, 0.83 h)	87.3° 13:45	11.24	99%	114.0°
2033-01-15 Sat	24	—	unknown	18:55–19:45 (good, 0.83 h)	87.3° 13:40	11.22	100%	119.4°
2033-01-16 Sun	24	—	unknown	18:55–19:45 (good, 0.83 h)	87.3° 13:35	11.2	98%	123.4°
2033-01-17 Mon	25	—	unknown	19:00–19:45 (good, 0.75 h)	87.3° 13:30	11.17	94%	125.7°
2033-01-18 Tue	26	—	unknown	19:00–19:50 (good, 0.83 h)	87.3° 13:30	11.15	89%	126.3°
2033-01-19 Wed	25	—	unknown	19:00–19:45 (good, 0.75 h)	87.3° 13:25	11.12	83%	125.0°
2033-01-20 Thu	23	—	unknown	19:00–19:40 (good, 0.67 h)	87.3° 13:20	11.1	75%	122.1°
2033-01-21 Fri	20	—	unknown	19:05–19:35 (good, 0.5 h)	87.3° 13:15	11.07	67%	117.9°
2033-01-22 Sat	19	—	unknown	19:05–19:30 (good, 0.42 h)	87.3° 13:15	11.05	58%	112.4°
2033-01-23 Sun	18	—	unknown	19:05–19:30 (good, 0.42 h)	87.3° 13:10	11.02	48%	106.2°
2033-01-24 Mon	16	—	unknown	19:05–19:25 (good, 0.33 h)	87.3° 13:05	10.99	38%	99.2°
2033-01-25 Tue	15	—	unknown	19:05–19:20 (good, 0.25 h)	87.3° 13:00	10.96	29%	91.7°
2033-01-26 Wed	13	—	unknown	19:10–19:15 (good, 0.08 h)	87.3° 12:55	10.93	20%	83.9°
2033-01-27 Thu	12	—	unknown	19:10–19:15 (good, 0.08 h)	87.3° 12:55	10.91	12%	76.1°
2033-01-28 Fri	12	—	unknown	18:35–19:45 (marginal, 1.17 h)	87.3° 12:50	10.87	6%	68.7°
2033-01-29 Sat	11	—	unknown	19:10–19:40 (marginal, 0.5 h)	87.3° 12:45	10.84	2%	62.0°
2033-01-30 Sun	10	—	unknown	19:10–19:35 (marginal, 0.42 h)	87.3° 12:40	10.81	0%	57.0°
2033-01-31 Mon	8	—	unknown	19:15–19:30 (marginal, 0.25 h)	87.3° 12:35	10.78	2%	54.1°
2033-02-01 Tue	9	—	unknown	05:40–06:00 (marginal, 0.33 h)	87.3° 12:35	10.75	6%	54.1°
2033-02-02 Wed	9	—	unknown	05:35–06:00 (marginal, 0.42 h)	87.3° 12:30	10.71	13%	56.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-01-04&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.