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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: 07-22 (10), 07-20 (9), 07-21 (9), 07-23 (9), 07-24 (9) — by astronomy; check the weather when the night is within four days.
2032-06-26astronomy score per night — click a bar for that night2032-07-25
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2032-06-26 Sat 0 — unknown — 72.5° 10:45 4.46 84% 95.8°
2032-06-27 Sun 0 — unknown — 72.5° 10:40 4.48 74% 81.3°
2032-06-28 Mon 0 — unknown — 72.5° 10:40 4.49 63% 67.0°
2032-06-29 Tue 0 — unknown — 72.5° 10:35 4.51 52% 53.0°
2032-06-30 Wed 0 — unknown — 72.5° 10:30 4.53 41% 39.4°
2032-07-01 Thu 0 — unknown — 72.5° 10:25 4.55 30% 26.2°
2032-07-02 Fri 0 — unknown — 72.5° 10:20 4.57 21% 13.6°
2032-07-03 Sat 0 — unknown — 72.5° 10:20 4.6 13% 6.0°
2032-07-04 Sun 0 — unknown — 72.5° 10:15 4.63 7% 14.8°
2032-07-05 Mon 0 — unknown — 72.5° 10:10 4.65 3% 26.7°
2032-07-06 Tue 0 — unknown — 72.5° 10:05 4.68 1% 38.9°
2032-07-07 Wed 1 — unknown — 72.5° 10:00 4.72 0% 51.0°
2032-07-08 Thu 1 — unknown — 72.5° 10:00 4.75 2% 62.9°
2032-07-09 Fri 1 — unknown — 72.5° 09:55 4.78 5% 74.8°
2032-07-10 Sat 1 — unknown — 72.5° 09:50 4.82 10% 86.6°
2032-07-11 Sun 2 — unknown 04:40–04:45 (marginal, 0.08 h) 72.5° 09:45 4.86 16% 98.3°
2032-07-12 Mon 2 — unknown 04:35–04:45 (marginal, 0.17 h) 72.5° 09:45 4.9 24% 110.1°
2032-07-13 Tue 2 — unknown 04:35–04:45 (marginal, 0.17 h) 72.5° 09:40 4.94 32% 121.9°
2032-07-14 Wed 3 — unknown 04:30–04:50 (marginal, 0.33 h) 72.5° 09:35 4.98 42% 133.9°
2032-07-15 Thu 3 — unknown 04:25–04:50 (marginal, 0.42 h) 72.5° 09:30 5.02 52% 146.0°
2032-07-16 Fri 4 — unknown 04:20–04:50 (marginal, 0.5 h) 72.5° 09:25 5.07 62% 158.2°
2032-07-17 Sat 6 — unknown 04:15–04:50 (marginal, 0.58 h) 72.5° 09:25 5.11 72% 170.0°
2032-07-18 Sun 7 — unknown 04:15–04:50 (marginal, 0.58 h) 72.5° 09:20 5.16 81% 171.8°
2032-07-19 Mon 8 — unknown 04:10–04:55 (marginal, 0.75 h) 72.5° 09:15 5.2 89% 159.7°
2032-07-20 Tue 9 — unknown 03:40–04:55 (marginal, 1.25 h) 72.5° 09:10 5.25 95% 145.8°
2032-07-21 Wed 9 — unknown 03:35–04:55 (marginal, 1.33 h) 72.5° 09:05 5.3 99% 131.3°
2032-07-22 Thu 10 — unknown 03:30–04:55 (marginal, 1.42 h) 72.5° 09:05 5.35 100% 116.4°
2032-07-23 Fri 9 — unknown 03:25–04:10 (marginal, 0.75 h) 72.5° 09:00 5.4 98% 101.4°
2032-07-24 Sat 9 — unknown 03:25–04:15 (marginal, 0.83 h) 72.5° 08:55 5.45 93% 86.4°
2032-07-25 Sun 8 — unknown 03:30–04:15 (marginal, 0.75 h) 72.5° 08:50 5.5 86% 71.6°

Download: CSV · JSON


💡 API
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-06-26&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.