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 Triangulum Pinwheel: 10-11 (100), 10-12 (100), 10-13 (100), 10-14 (100), 10-15 (100) — by astronomy; check the weather when the night is within four days.

2036-10-09astronomy score per night — click a bar for that night2036-11-07

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-10-09 Thu	87	—	unknown	20:25–00:10 (good, 3.75 h)	79.2° 01:40	9.58	79%	44.3°
2036-10-10 Fri	94	—	unknown	20:20–04:00 (good, 7.67 h)	79.2° 01:35	9.63	70%	55.7°
2036-10-11 Sat	100	—	unknown	20:20–05:50 (good, 9.5 h)	79.1° 01:35	9.67	59%	67.8°
2036-10-12 Sun	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.2° 01:30	9.71	48%	80.4°
2036-10-13 Mon	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.2° 01:25	9.76	37%	93.2°
2036-10-14 Tue	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.2° 01:20	9.8	26%	106.2°
2036-10-15 Wed	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:15	9.85	17%	119.1°
2036-10-16 Thu	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.1° 01:15	9.89	9%	131.7°
2036-10-17 Fri	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.2° 01:10	9.93	3%	143.1°
2036-10-18 Sat	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.2° 01:05	9.97	1%	152.0°
2036-10-19 Sun	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.2° 01:00	10.02	0%	155.7°
2036-10-20 Mon	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 00:55	10.06	3%	152.3°
2036-10-21 Tue	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 00:55	10.1	7%	144.1°
2036-10-22 Wed	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.2° 00:50	10.14	14%	133.9°
2036-10-23 Thu	100	—	unknown	20:05–06:15 (good, 10.17 h)	79.2° 00:45	10.18	21%	123.1°
2036-10-24 Fri	100	—	unknown	20:00–06:15 (good, 10.25 h)	79.2° 00:40	10.22	30%	112.1°
2036-10-25 Sat	100	—	unknown	20:00–05:10 (good, 10.17 h)	79.1° 00:40	10.26	39%	101.1°
2036-10-26 Sun	100	—	unknown	19:00–05:05 (good, 10.08 h)	79.2° 23:35	10.3	49%	90.3°
2036-10-27 Mon	100	—	unknown	18:55–05:00 (good, 10.08 h)	79.2° 23:30	10.34	58%	79.5°
2036-10-28 Tue	100	—	unknown	18:55–05:00 (good, 10.08 h)	79.2° 23:25	10.37	67%	68.8°
2036-10-29 Wed	99	—	unknown	20:15–04:55 (good, 8.67 h)	79.1° 23:20	10.41	76%	58.2°
2036-10-30 Thu	91	—	unknown	00:15–04:50 (good, 4.58 h)	79.1° 23:20	10.45	83%	47.9°
2036-10-31 Fri	83	—	unknown	03:50–04:45 (good, 0.92 h)	79.2° 23:15	10.49	90%	38.2°
2036-11-01 Sat	53	—	unknown	18:50–05:10 (marginal, 10.33 h)	79.2° 23:10	10.52	95%	29.9°
2036-11-02 Sun	35	—	unknown	00:30–04:40 (marginal, 4.17 h)	79.2° 23:05	10.56	98%	24.8°
2036-11-03 Mon	35	—	unknown	18:50–22:10 (marginal, 3.33 h)	79.1° 23:00	10.59	100%	25.5°
2036-11-04 Tue	41	—	unknown	18:50–23:05 (marginal, 4.25 h)	79.1° 23:00	10.63	99%	31.8°
2036-11-05 Wed	56	—	unknown	18:45–04:00 (marginal, 9.25 h)	79.2° 22:55	10.66	96%	41.4°
2036-11-06 Thu	91	—	unknown	18:45–21:35 (good, 2.83 h)	79.2° 22:50	10.7	90%	52.7°
2036-11-07 Fri	98	—	unknown	18:45–00:50 (good, 6.08 h)	79.2° 22:45	10.73	83%	64.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-10-09&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.