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 Andromeda Galaxy: 08-28 (100), 08-29 (100), 08-30 (100), 08-31 (100), 09-01 (100) — by astronomy; check the weather when the night is within four days.

2032-08-19astronomy score per night — click a bar for that night2032-09-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-08-19 Thu	74	—	unknown	00:40–04:55 (good, 4.25 h)	89.8° 04:10	6.9	98%	76.2°
2032-08-20 Fri	63	—	unknown	04:15–04:55 (good, 0.67 h)	89.7° 04:05	6.96	100%	63.8°
2032-08-21 Sat	45	—	unknown	21:55–04:55 (marginal, 7.0 h)	89.6° 04:00	7.02	99%	52.1°
2032-08-22 Sun	37	—	unknown	21:55–05:00 (marginal, 7.08 h)	89.6° 04:00	7.08	95%	42.0°
2032-08-23 Mon	41	—	unknown	21:50–05:00 (marginal, 7.17 h)	89.7° 03:55	7.13	88%	35.0°
2032-08-24 Tue	68	—	unknown	21:50–22:05 (good, 0.25 h)	89.8° 03:50	7.19	80%	32.8°
2032-08-25 Wed	83	—	unknown	21:50–01:35 (good, 3.75 h)	89.7° 03:45	7.25	70%	35.9°
2032-08-26 Thu	88	—	unknown	21:45–05:05 (good, 7.33 h)	89.5° 03:40	7.3	59%	42.7°
2032-08-27 Fri	94	—	unknown	21:45–05:05 (good, 7.33 h)	89.6° 03:40	7.36	49%	51.5°
2032-08-28 Sat	100	—	unknown	21:40–05:05 (good, 7.42 h)	89.7° 03:35	7.42	39%	61.1°
2032-08-29 Sun	100	—	unknown	21:40–05:10 (good, 7.5 h)	89.7° 03:30	7.47	29%	71.1°
2032-08-30 Mon	100	—	unknown	21:40–05:10 (good, 7.5 h)	89.6° 03:25	7.53	21%	81.2°
2032-08-31 Tue	100	—	unknown	21:35–05:10 (good, 7.58 h)	89.5° 03:25	7.59	14%	91.3°
2032-09-01 Wed	100	—	unknown	21:35–05:15 (good, 7.67 h)	89.7° 03:20	7.64	8%	101.2°
2032-09-02 Thu	100	—	unknown	21:30–05:15 (good, 7.75 h)	89.8° 03:15	7.7	4%	111.0°
2032-09-03 Fri	100	—	unknown	21:30–05:15 (good, 7.75 h)	89.7° 03:10	7.75	1%	120.4°
2032-09-04 Sat	100	—	unknown	21:30–05:15 (good, 7.75 h)	89.6° 03:05	7.81	0%	129.3°
2032-09-05 Sun	100	—	unknown	21:25–05:20 (good, 7.92 h)	89.6° 03:05	7.86	1%	137.1°
2032-09-06 Mon	100	—	unknown	21:25–05:20 (good, 7.92 h)	89.7° 03:00	7.92	4%	143.3°
2032-09-07 Tue	100	—	unknown	21:20–05:20 (good, 8.0 h)	89.8° 02:55	7.97	8%	146.7°
2032-09-08 Wed	100	—	unknown	21:20–05:20 (good, 8.0 h)	89.7° 02:50	8.03	14%	146.4°
2032-09-09 Thu	100	—	unknown	21:20–05:25 (good, 8.08 h)	89.5° 02:45	8.08	22%	142.4°
2032-09-10 Fri	100	—	unknown	21:15–05:25 (good, 8.17 h)	89.6° 02:45	8.14	31%	135.4°
2032-09-11 Sat	100	—	unknown	21:15–05:25 (good, 8.17 h)	89.7° 02:40	8.19	41%	126.5°
2032-09-12 Sun	100	—	unknown	21:10–05:25 (good, 8.25 h)	89.7° 02:35	8.24	52%	116.3°
2032-09-13 Mon	100	—	unknown	21:10–05:30 (good, 8.33 h)	89.6° 02:30	8.3	62%	105.2°
2032-09-14 Tue	100	—	unknown	21:10–05:30 (good, 8.33 h)	89.5° 02:30	8.35	73%	93.5°
2032-09-15 Wed	100	—	unknown	21:15–05:30 (good, 8.25 h)	89.7° 02:25	8.4	83%	81.4°
2032-09-16 Thu	100	—	unknown	23:10–05:30 (good, 6.33 h)	89.8° 02:20	8.45	91%	69.2°
2032-09-17 Fri	67	—	unknown	03:35–05:35 (good, 2.0 h)	89.7° 02:15	8.51	97%	57.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-08-19&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.