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 North America Nebula: 01-18 (26), 01-17 (25), 01-19 (25), 01-20 (23), 01-21 (21) — by astronomy; check the weather when the night is within four days.

2033-01-17astronomy score per night — click a bar for that night2033-02-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-01-17 Mon	25	—	unknown	19:00–19:45 (good, 0.75 h)	87.2° 13:30	11.17	94%	125.7°
2033-01-18 Tue	26	—	unknown	19:00–19:50 (good, 0.83 h)	87.2° 13:30	11.15	89%	126.2°
2033-01-19 Wed	25	—	unknown	19:00–19:45 (good, 0.75 h)	87.2° 13:25	11.12	83%	125.0°
2033-01-20 Thu	23	—	unknown	19:00–19:40 (good, 0.67 h)	87.2° 13:20	11.1	75%	122.1°
2033-01-21 Fri	21	—	unknown	19:05–19:35 (good, 0.5 h)	87.2° 13:15	11.07	67%	117.8°
2033-01-22 Sat	20	—	unknown	19:05–19:35 (good, 0.5 h)	87.2° 13:15	11.05	58%	112.4°
2033-01-23 Sun	18	—	unknown	19:05–19:30 (good, 0.42 h)	87.2° 13:10	11.02	48%	106.1°
2033-01-24 Mon	16	—	unknown	19:05–19:25 (good, 0.33 h)	87.2° 13:05	10.99	38%	99.2°
2033-01-25 Tue	15	—	unknown	19:05–19:20 (good, 0.25 h)	87.2° 13:00	10.96	29%	91.7°
2033-01-26 Wed	13	—	unknown	19:10–19:15 (good, 0.08 h)	87.2° 12:55	10.93	20%	84.0°
2033-01-27 Thu	12	—	unknown	19:10–19:15 (good, 0.08 h)	87.2° 12:55	10.91	12%	76.2°
2033-01-28 Fri	12	—	unknown	18:35–19:45 (marginal, 1.17 h)	87.2° 12:50	10.87	6%	68.7°
2033-01-29 Sat	11	—	unknown	19:10–19:40 (marginal, 0.5 h)	87.2° 12:45	10.84	2%	62.1°
2033-01-30 Sun	10	—	unknown	19:10–19:35 (marginal, 0.42 h)	87.2° 12:40	10.81	0%	57.0°
2033-01-31 Mon	8	—	unknown	19:15–19:30 (marginal, 0.25 h)	87.2° 12:35	10.78	2%	54.2°
2033-02-01 Tue	9	—	unknown	05:40–06:00 (marginal, 0.33 h)	87.2° 12:35	10.75	6%	54.1°
2033-02-02 Wed	9	—	unknown	05:35–06:00 (marginal, 0.42 h)	87.2° 12:30	10.71	13%	56.8°
2033-02-03 Thu	9	—	unknown	05:30–06:00 (marginal, 0.5 h)	87.2° 12:25	10.68	22%	61.8°
2033-02-04 Fri	9	—	unknown	05:25–05:55 (marginal, 0.5 h)	87.2° 12:20	10.65	32%	68.3°
2033-02-05 Sat	9	—	unknown	05:25–05:55 (marginal, 0.5 h)	87.2° 12:15	10.61	43%	75.7°
2033-02-06 Sun	9	—	unknown	05:20–06:25 (marginal, 1.08 h)	87.2° 12:15	10.58	54%	83.5°
2033-02-07 Mon	10	—	unknown	05:50–05:55 (good, 0.08 h)	87.2° 12:10	10.54	65%	91.3°
2033-02-08 Tue	11	—	unknown	05:45–05:55 (good, 0.17 h)	87.2° 12:05	10.5	74%	98.9°
2033-02-09 Wed	11	—	unknown	05:45–05:50 (good, 0.08 h)	87.2° 12:00	10.47	82%	106.1°
2033-02-10 Thu	12	—	unknown	05:40–05:50 (good, 0.17 h)	87.2° 11:55	10.43	89%	112.5°
2033-02-11 Fri	11	—	unknown	05:45–05:50 (good, 0.08 h)	87.2° 11:50	10.39	95%	118.1°
2033-02-12 Sat	12	—	unknown	05:40–05:50 (good, 0.17 h)	87.2° 11:45	10.35	98%	122.4°
2033-02-13 Sun	11	—	unknown	05:40–05:45 (good, 0.08 h)	87.2° 11:40	10.31	100%	125.1°
2033-02-14 Mon	12	—	unknown	05:35–05:45 (good, 0.17 h)	87.2° 11:40	10.27	100%	126.2°
2033-02-15 Tue	13	—	unknown	05:30–05:45 (good, 0.25 h)	87.2° 11:35	10.23	98%	125.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-01-17&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.