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 3C 273: 01-02 (93), 01-03 (93), 01-04 (93), 01-05 (93), 01-06 (93) — by astronomy; check the weather when the night is within four days.

2032-12-21astronomy score per night — click a bar for that night2033-01-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-12-21 Tue	19	—	unknown	03:00–06:05 (marginal, 3.08 h)	50.2° 06:45	11.51	76%	38.1°
2032-12-22 Wed	21	—	unknown	02:50–06:10 (marginal, 3.33 h)	50.2° 06:45	11.51	68%	26.5°
2032-12-23 Thu	28	—	unknown	02:30–06:10 (marginal, 3.67 h)	50.2° 06:40	11.5	59%	15.3°
2032-12-24 Fri	37	—	unknown	04:30–06:10 (good, 1.67 h)	50.2° 06:35	11.5	49%	7.0°
2032-12-25 Sat	47	—	unknown	03:05–06:10 (good, 3.08 h)	50.2° 06:30	11.5	40%	12.0°
2032-12-26 Sun	58	—	unknown	02:55–06:10 (good, 3.25 h)	50.2° 06:25	11.49	31%	23.1°
2032-12-27 Mon	69	—	unknown	02:35–06:10 (good, 3.58 h)	50.2° 06:25	11.49	22%	35.1°
2032-12-28 Tue	80	—	unknown	02:30–06:10 (good, 3.67 h)	50.2° 06:20	11.48	14%	47.7°
2032-12-29 Wed	87	—	unknown	02:30–06:10 (good, 3.67 h)	50.2° 06:15	11.47	8%	60.8°
2032-12-30 Thu	90	—	unknown	02:25–06:10 (good, 3.75 h)	50.2° 06:10	11.47	3%	74.2°
2032-12-31 Fri	91	—	unknown	02:20–06:10 (good, 3.83 h)	50.2° 06:05	11.46	0%	88.0°
2033-01-01 Sat	92	—	unknown	02:15–06:10 (good, 3.92 h)	50.2° 06:05	11.45	0%	102.2°
2033-01-02 Sun	93	—	unknown	02:15–06:10 (good, 3.92 h)	50.2° 06:00	11.44	3%	116.5°
2033-01-03 Mon	93	—	unknown	02:10–06:10 (good, 4.0 h)	50.2° 05:55	11.42	9%	130.9°
2033-01-04 Tue	93	—	unknown	02:05–06:10 (good, 4.08 h)	50.2° 05:50	11.41	16%	145.3°
2033-01-05 Wed	93	—	unknown	02:00–06:10 (good, 4.17 h)	50.2° 05:50	11.4	26%	159.3°
2033-01-06 Thu	93	—	unknown	01:55–06:10 (good, 4.25 h)	50.2° 05:45	11.38	36%	171.6°
2033-01-07 Fri	93	—	unknown	01:55–06:10 (good, 4.25 h)	50.2° 05:40	11.37	48%	169.0°
2033-01-08 Sat	93	—	unknown	01:50–06:10 (good, 4.33 h)	50.2° 05:35	11.35	59%	156.4°
2033-01-09 Sun	93	—	unknown	01:50–06:10 (good, 4.33 h)	50.2° 05:30	11.34	69%	143.1°
2033-01-10 Mon	93	—	unknown	01:50–06:10 (good, 4.33 h)	50.2° 05:30	11.32	79%	129.8°
2033-01-11 Tue	93	—	unknown	01:50–06:10 (good, 4.33 h)	50.2° 05:25	11.3	87%	116.7°
2033-01-12 Wed	92	—	unknown	01:55–06:10 (good, 4.25 h)	50.2° 05:20	11.28	93%	103.7°
2033-01-13 Thu	66	—	unknown	02:45–06:10 (good, 3.42 h)	50.2° 05:15	11.26	97%	90.9°
2033-01-14 Fri	52	—	unknown	04:10–06:10 (good, 2.0 h)	50.2° 05:10	11.24	99%	78.3°
2033-01-15 Sat	40	—	unknown	01:25–06:10 (marginal, 4.75 h)	50.2° 05:10	11.22	100%	66.0°
2033-01-16 Sun	30	—	unknown	01:35–06:10 (marginal, 4.58 h)	50.2° 05:05	11.2	98%	53.8°
2033-01-17 Mon	23	—	unknown	01:40–06:10 (marginal, 4.5 h)	50.2° 05:00	11.17	94%	41.8°
2033-01-18 Tue	19	—	unknown	01:45–06:10 (marginal, 4.42 h)	50.2° 04:55	11.15	89%	30.1°
2033-01-19 Wed	23	—	unknown	01:10–06:10 (marginal, 5.0 h)	50.2° 04:55	11.12	83%	18.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-12-21&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.