About
  1. Step 1: Spot the moving object
  2. Step 2: Predict what happens next
  3. Step 3: Calculate time to arrival
1/3

Tactical Op · SPOT

Spot the moving object

Two exposures, 30 minutes apart, overlaid. Stars appear as single points. Tap both squares of the short trail left by the asteroid.

  • Sky
  • Fixed star
  • Moving trail

Tags 0