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 Seven Sisters: 12-20 (100), 12-21 (100), 12-22 (100), 12-23 (100), 12-24 (100) — by astronomy; check the weather when the night is within four days.

2032-12-16astronomy score per night — click a bar for that night2033-01-14

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-12-16 Thu	29	—	unknown	18:35–21:40 (marginal, 3.08 h)	72.6° 22:25	11.5	100%	27.7°
2032-12-17 Fri	48	—	unknown	18:35–01:00 (marginal, 6.42 h)	72.6° 22:20	11.5	99%	40.4°
2032-12-18 Sat	89	—	unknown	18:35–20:40 (good, 2.08 h)	72.6° 22:20	11.5	95%	53.0°
2032-12-19 Sun	97	—	unknown	18:35–23:25 (good, 4.83 h)	72.6° 22:15	11.51	90%	65.3°
2032-12-20 Mon	100	—	unknown	18:35–01:30 (good, 6.92 h)	72.6° 22:10	11.51	84%	77.4°
2032-12-21 Tue	100	—	unknown	18:35–02:45 (good, 8.17 h)	72.6° 22:05	11.51	76%	89.4°
2032-12-22 Wed	100	—	unknown	18:35–02:55 (good, 8.33 h)	72.6° 22:00	11.51	68%	101.2°
2032-12-23 Thu	100	—	unknown	18:40–03:00 (good, 8.33 h)	72.6° 22:00	11.5	59%	112.9°
2032-12-24 Fri	100	—	unknown	18:40–03:00 (good, 8.33 h)	72.6° 21:55	11.5	49%	124.7°
2032-12-25 Sat	100	—	unknown	18:40–03:00 (good, 8.33 h)	72.6° 21:50	11.5	40%	136.5°
2032-12-26 Sun	100	—	unknown	18:40–02:55 (good, 8.25 h)	72.6° 21:45	11.49	31%	148.4°
2032-12-27 Mon	100	—	unknown	18:40–02:55 (good, 8.25 h)	72.6° 21:40	11.49	22%	160.3°
2032-12-28 Tue	100	—	unknown	18:40–02:50 (good, 8.17 h)	72.6° 21:40	11.48	14%	171.1°
2032-12-29 Wed	100	—	unknown	18:40–02:45 (good, 8.08 h)	72.6° 21:35	11.47	8%	169.9°
2032-12-30 Thu	100	—	unknown	18:40–02:40 (good, 8.0 h)	72.6° 21:30	11.47	3%	157.9°
2032-12-31 Fri	100	—	unknown	18:45–02:40 (good, 7.92 h)	72.6° 21:25	11.46	0%	144.5°
2033-01-01 Sat	100	—	unknown	18:45–02:35 (good, 7.83 h)	72.6° 21:25	11.45	0%	130.5°
2033-01-02 Sun	100	—	unknown	18:45–02:30 (good, 7.75 h)	72.6° 21:20	11.44	3%	116.2°
2033-01-03 Mon	100	—	unknown	18:45–02:25 (good, 7.67 h)	72.6° 21:15	11.42	9%	101.7°
2033-01-04 Tue	100	—	unknown	18:45–02:20 (good, 7.58 h)	72.6° 21:10	11.41	16%	87.2°
2033-01-05 Wed	100	—	unknown	18:45–02:20 (good, 7.58 h)	72.6° 21:05	11.4	26%	72.9°
2033-01-06 Thu	98	—	unknown	18:50–02:15 (good, 7.42 h)	72.6° 21:05	11.38	36%	58.7°
2033-01-07 Fri	89	—	unknown	18:50–02:10 (good, 7.33 h)	72.6° 21:00	11.37	48%	44.7°
2033-01-08 Sat	80	—	unknown	21:05–02:05 (good, 5.0 h)	72.6° 20:55	11.35	59%	31.1°
2033-01-09 Sun	54	—	unknown	18:50–02:25 (marginal, 7.58 h)	72.6° 20:50	11.34	69%	18.0°
2033-01-10 Mon	37	—	unknown	18:50–02:10 (marginal, 7.33 h)	72.6° 20:45	11.32	79%	7.6°
2033-01-11 Tue	26	—	unknown	18:55–01:50 (marginal, 6.92 h)	72.6° 20:45	11.3	87%	12.2°
2033-01-12 Wed	22	—	unknown	18:55–21:00 (marginal, 2.08 h)	72.6° 20:40	11.28	93%	24.1°
2033-01-13 Thu	26	—	unknown	18:55–22:35 (marginal, 3.67 h)	72.6° 20:35	11.26	97%	36.5°
2033-01-14 Fri	40	—	unknown	18:55–01:20 (marginal, 6.42 h)	72.6° 20:30	11.24	99%	49.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-12-16&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.