Southern delta-Aquariids from Hefei in 2026

Southern delta-Aquariids from Hefei: the short answer

Marginal from Hefei, Anhui. Maximum 21:23 on 31 July 2026; the radiant reaches 42.2° at 02:19 and the ideal-sky rate tops out at 3.5 an hour with the Moon 96% lit.

That ranks it 12th of twelve from Hefei this year, behind the Geminids (149.8/h) and the Perseids (84.0/h).

The radiant track over this city

Aquarius carries the radiant. From Hefei it clears the horizon at 21:00 on a bearing of 109° (ESE), reaches 42.2° at 02:19 in the south, and drops back below the horizon at 07:38. Within the observing window it peaks at 42.0°.

When it gets dark here

Hefei loses the Sun at 19:08 and gets it back at 05:26. True astronomical darkness — the only part that counts for faint meteors — runs 20:41 to 03:53, 7 h 13 min out of 10 h 18 min of night.

Local solar midnight, the true middle of the night, falls at 00:17 here rather than at 00:00: Asia/Shanghai runs 11 minutes ahead of mean solar time at 117.28°E. That offset is why the best hour on this page is not the hour you would guess from the clock.

What the Moon does here

Moonlight is the limiting factor on this night from Hefei. The Moon is 96% lit and only 1 of 9 sampled hours are moon-free. Moonrise 20:12. Moonset 07:40. At the best hour it stands 44.7° above the horizon, 8° from the radiant, pulling the limiting magnitude down to 5.16.

Why 4 an hour and not 25

Converting ZHR 25 into something useful for Hefei means multiplying by sin(42.0°) and dividing by 3.2 raised to (6.5 − 5.16). That lands at 3.5 meteors an hour, from fast 40.6 km/s entries.

Hour by hour the modelled rate runs from 0.0 at 20:00 (radiant -12.4°) to 2.2 at 04:00 (radiant 36.4°), peaking at 3.5. That spread across 9 hours is why a "what time" answer beats a "how many" answer.

The stream comes from Comet 96P/Machholz and is listed as active 12 July to 23 August, so 31 July 2026 is the best night from Hefei rather than the only one.

Watching from around Hefei

Hefei, Anhui is the 56th largest of the 300 cities covered here, with a population of 5.05 million at 24 m above sea level. The nearest other cities on the site are Lu’an (74 km W), Huainan (89 km NNW), Wuhu (123 km ESE) — close enough that the radiant altitudes barely change, far enough that sunset and moonrise do.

What this page does not know

Light-pollution data for this location is not connected yet. Rates on this page are computed against the reference rural sky the zenithal hourly rate is defined for (naked-eye limiting magnitude 6.5); they are not a claim about how bright the sky is where you are standing. Once the light-pollution layer is connected these figures will be recomputed for the local sky and will generally fall.

Cloud cover is a forecast, not a constant, so it is resolved when you load the tonight card and is deliberately absent from this prerendered page — the hourly table shows "unavailable" rather than assuming clear skies. Meteor outbursts, local terrain and building horizons are not modelled.

A single observer with an unobstructed horizon typically records 30–50% below the ideal-sky figure. Give your eyes twenty minutes to adapt, keep bright screens away, look about halfway up the sky rather than straight at the radiant, and count for a full hour before judging a shower.