AstroShot

Phone Sensor Pointing

Use the phone compass, gyroscope, and accelerometer to control simulated azimuth and tilt. Data stays in this tab.

Not enabled

HTTPS and explicit permission are required. Magnetic cases, tripods, vehicles, and nearby metal can disturb the compass; calibrate before locking.
Plan & Preview Export

AI compositing material

Export a standalone sky or trail PNG. This app does not composite or upload photographs.

Plan and preview

JSON, composite preview, and print view are generated on this device.

Share plan

The link contains reduced plan data, not the photograph or original EXIF.

External AI handoff text

Creates prompt text and plan data only; no AI is called and no photo is uploaded.

Photo Sky & Trail Preview
These settings control standalone sky material and can also preview it over an imported photo.
Photo Confirmation & Alignment

Choose a photo in Photo Import & EXIF first.

Photo Import & EXIF
Photo privacy

The photo and EXIF are processed only in this browser tab and are not uploaded or stored automatically.

JPEG EXIF is currently supported. Direction appears only when the camera or phone writes GPSImgDirection; PNG, WebP, and HEIC metadata support varies by browser.
Photography Planning
Field of view73.7° × 53.1°
Light Pollution
Combined darkness0/100
Bortle8–9
Estimated sky brightness
17.2–18.3 mag/arcsec²
Naked-eye limit
3.5–4.5 mag
Visible-star estimate
50–250 stars
Urban light domes
Strong urban skyglow in every direction

Moonlight adjustmentMoon above horizon at 91% illumination; darkness score reduced.

Compare sites
Site-level historical estimates informed by the 2016 World Atlas concept, without direct raster sampling; Bortle, SQM, and star counts are ranges, not live measurements.
Weather Conditions
Loading observing weather…
Offline Data & Updates
Download incompleteCore assets 0/5
Star catalog
Missing
Browser storage use
Unavailable
Last prepared
Not recorded
Weather is external data. Offline mode shows only the last successful cached result with its age. Custom locations remain in this browser.
Taiwan Observing Map

Taipei

Taipei City

10 m
Light pollution
High urban light pollution
Horizon
Buildings may obstruct the low horizon
Access / parking
Good transit; parking depends on local rules
Caution
Best for the Moon, planets, and bright objects
Static planning reference only; check current road, park, parking, and weather notices before travel.
Milky Way Planner

Galactic Core

SW · altitude 21.7°

Core rise
07:55
Core set
17:57
Darkness starts
12:01
Darkness ends
19:57
Suggested window12:02–12:52Best altitude 36° · S

Good conditions: the core is high with limited moonlight.

Estimated from core altitude, Sun below −18°, and approximate moonlight; weather, light pollution, and terrain are excluded.
Moon & Moonlight

Waning Gibbous

91% illuminated · age 17.6 days

Azimuth
127.0°
Altitude
45.2°
Next moonrise
12:46
Next moonset
00:20

Moonlight impactHigh: the Milky Way and faint objects are harder to see

+1dWaning Gibbous84%
+2dWaning Gibbous76%
+3dLast Quarter65%
+4dLast Quarter54%
Moon position, rise/set, and impact are low-precision approximations without terrain or refraction.
Constellations
Constellation linesShow constellation figures
Constellation namesShow localized labels

Figures are identification guides, not official constellation boundaries.

Object Search

Try Sirius, Orion, or M42

Observation
Observing siteTaipei25.0330°N · 121.5654°E
Add custom location
Sensor noiseSimulate high-ISO sensor grain
Tonight's Sky

Tonight's Sky

Recommended for the current site and simulation time

Directions, altitude, and rise times are approximate; weather and terrain are not included.

Star Appearance
Meteor System
HYG v4.1 · HIPPARCOS / YALE / GLIESE
CC BY-SA 4.0Loading