The frame

Date

15 August 2026

Local time

20:02UTC-07:00

Camera

SONY HDR-SR12

ISO

not recorded by this camera

Exposure

1/60 s

Aperture

f/2

Elevation

500–1000 mpublished as a band, not a value

The sky

Sun

-5°civil twilight

Moon

14.9°14.0% lit · waxing crescent

Moonless dark

7 h 27 minthe Moon was above the horizon for part of the night

Galactic centre

25.1°peaked at 26.6° · core season

Astronomical night

21:12–04:45local time, to the minute

Moonrise / set

09:22 / 20:59

Perseids

radiant 4.4°3.4 days after peak · nominal ZHR 150 · IMO Working List of Visual Meteor Showers, retrieved 2026-08-22T01:11:29Z

Computed from place and instant with astronomy-engine 2.1.19. Angles are published to 0.1° and times to the minute — finer values would invert back to a location.

The atmosphere

Cloud, low

0%ncep_hrrr_conus analysis

Cloud, mid

0%ncep_hrrr_conus analysis

Cloud, high

0%ncep_hrrr_conus analysis

Humidity

60%ncep_hrrr_conus 3 km

Visibility

29.2kmncep_hrrr_conus 3 km

Temperature

21.6°Cncep_hrrr_conus 3 km

Aerosol depth

0.05cams-global 45 km — regional, not local

Smoke

not available for this date

None of this was measured at the site. The camera records no temperature, humidity or pressure, so every value here is a numerical weather model interpolated to a point it never observed. A 3 km cell is not a point: “20% low cloud” means the cell was one-fifth covered, not that the sky above the tripod was. The photograph is the only evidence of what it was actually like.

Light pollution

Radiance

no satellite radiance for this place yet

Sky brightness

not modelled — see the note below

Bortle

no radiance, so no class

Bortle class is a visual scale defined by what a person can see. Satellites measure upward radiance, which is a different quantity from downward sky brightness at the zenith. Getting between them needs a propagation model whose terms are unresolved, so no conversion is applied rather than a fabricated one — and any class shown is always a range.

The place

Area

Oat Mountain

Published as

named area · ±5 kmphotographer-supplied location, stated to ±1500 m; published as a named area no tighter than its own uncertainty

The exact location is deliberately not published. Places appear as named areas because a precise pin is defeated by repetition — with enough frames around one point, an offset averages back to the truth.