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From the angle of the horizon...from whence it came.
originally posted by: Phage
a reply to: Erno86
From the angle of the horizon...from whence it came.
The "angle of the horizon" is 0º. When a jet plane becomes visible above the horizon it is at the same angle above the horizon as the ISS, Venus, or a ship on the sea when they become visible above the horizon. Each is at a different altitude. Angle of elevation above the horizon provides no information about altitude, unless you know how far away the object is.
originally posted by: AdmireTheDistance
a reply to: Erno86
3,000 feet up and moving 15,000 miles per hour? That must've been one hell of a sonic boom.
Yes. But if you can see the horizon will see the jet as soon as it appears above it.
If a jet fighter is flying at tree top level you'll never see it until it is almost over your head --- but if it is much higher in altitude --- you'll see it much further away because the jet is higher in altitude
originally posted by: Erno86
originally posted by: AdmireTheDistance
a reply to: Erno86
3,000 feet up and moving 15,000 miles per hour? That must've been one hell of a sonic boom.
No sound at all...even though we were travelling down a divided highway, about 60 mph in a full windowed Ford Van
originally posted by: AdmireTheDistance
originally posted by: Erno86
originally posted by: AdmireTheDistance
a reply to: Erno86
3,000 feet up and moving 15,000 miles per hour? That must've been one hell of a sonic boom.
No sound at all...even though we were travelling down a divided highway, about 60 mph in a full windowed Ford Van
I'd say that's a pretty damn good indication then, that nothing flew 3,000 feet over your head doing almost mach 20.