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: 03-04 (93), 03-05 (93), 03-06 (93), 03-07 (93), 03-08 (93) — by astronomy; check the weather when the night is within four days.

2032-03-01astronomy score per night — click a bar for that night2032-03-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-03-01 Mon	66	—	unknown	22:25–22:40 (good, 0.25 h)	50.2° 02:10	9.62	81%	28.6°
2032-03-02 Tue	85	—	unknown	22:20–02:15 (good, 3.92 h)	50.2° 02:05	9.58	72%	41.1°
2032-03-03 Wed	90	—	unknown	22:15–04:45 (good, 6.5 h)	50.2° 02:05	9.53	62%	53.9°
2032-03-04 Thu	93	—	unknown	22:10–05:20 (good, 7.17 h)	50.2° 02:00	9.48	52%	67.2°
2032-03-05 Fri	93	—	unknown	22:10–05:20 (good, 7.17 h)	50.2° 01:55	9.44	40%	80.8°
2032-03-06 Sat	93	—	unknown	22:05–05:15 (good, 7.17 h)	50.2° 01:50	9.39	30%	94.8°
2032-03-07 Sun	93	—	unknown	22:00–05:15 (good, 7.25 h)	50.2° 01:45	9.34	20%	109.1°
2032-03-08 Mon	93	—	unknown	21:55–05:15 (good, 7.33 h)	50.2° 01:45	9.29	11%	123.7°
2032-03-09 Tue	93	—	unknown	21:50–05:10 (good, 7.33 h)	50.2° 01:40	9.25	5%	138.5°
2032-03-10 Wed	93	—	unknown	21:50–05:10 (good, 7.33 h)	50.2° 01:35	9.2	1%	153.0°
2032-03-11 Thu	93	—	unknown	21:45–05:05 (good, 7.33 h)	50.2° 01:30	9.15	0%	166.6°
2032-03-12 Fri	93	—	unknown	21:40–05:05 (good, 7.42 h)	50.2° 01:25	9.1	2%	171.5°
2032-03-13 Sat	93	—	unknown	21:35–05:05 (good, 7.5 h)	50.2° 01:25	9.05	7%	160.4°
2032-03-14 Sun	93	—	unknown	21:35–05:00 (good, 7.42 h)	50.2° 01:20	9.0	14%	147.2°
2032-03-15 Mon	93	—	unknown	21:30–05:00 (good, 7.5 h)	50.2° 01:15	8.95	22%	134.1°
2032-03-16 Tue	93	—	unknown	21:30–05:00 (good, 7.5 h)	50.2° 01:10	8.9	31%	121.2°
2032-03-17 Wed	93	—	unknown	21:30–04:55 (good, 7.42 h)	50.2° 01:10	8.85	41%	108.8°
2032-03-18 Thu	93	—	unknown	21:30–04:55 (good, 7.42 h)	50.2° 01:05	8.8	51%	96.6°
2032-03-19 Fri	91	—	unknown	21:40–04:50 (good, 7.17 h)	50.2° 01:00	8.75	60%	84.6°
2032-03-20 Sat	87	—	unknown	22:35–04:50 (good, 6.25 h)	50.2° 00:55	8.69	69%	72.8°
2032-03-21 Sun	83	—	unknown	00:20–04:45 (good, 4.42 h)	50.2° 00:50	8.64	78%	61.2°
2032-03-22 Mon	79	—	unknown	04:10–04:40 (good, 0.5 h)	50.2° 00:50	8.59	85%	49.5°
2032-03-23 Tue	46	—	unknown	21:20–04:45 (marginal, 7.42 h)	50.2° 00:45	8.54	91%	37.9°
2032-03-24 Wed	30	—	unknown	23:45–04:45 (marginal, 5.0 h)	50.2° 00:40	8.48	96%	26.3°
2032-03-25 Thu	25	—	unknown	00:15–04:30 (marginal, 4.25 h)	50.2° 00:35	8.43	99%	15.1°
2032-03-26 Fri	24	—	unknown	21:00–04:20 (marginal, 7.33 h)	50.2° 00:30	8.38	100%	7.7°
2032-03-27 Sat	28	—	unknown	20:40–05:10 (marginal, 7.5 h)	50.2° 00:30	8.32	99%	14.0°
2032-03-28 Sun	43	—	unknown	21:20–05:05 (marginal, 7.75 h)	50.2° 01:25	8.27	96%	25.6°
2032-03-29 Mon	83	—	unknown	21:35–22:35 (good, 1.0 h)	50.2° 01:20	8.22	92%	38.0°
2032-03-30 Tue	89	—	unknown	21:30–01:35 (good, 4.08 h)	50.2° 01:15	8.16	85%	50.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-03-01&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.