A launch from Kennedy (KSC), seen from San Francisco

From San Francisco, Kennedy Space Center (LC-39A) is about 3987 km away. Face E (roughly 92°) shortly after liftoff and watch low on the horizon — the rocket climbs as it heads downrange.

You're not watching the rocket itself — beyond a few km the vehicle is far too small to see. What's visible is the engine plume at 65–100+ km altitude: at night a brilliant moving flame (routinely seen 300+ km away), at dawn/dusk a sunlit "jellyfish" cloud that has been documented 800+ km away, in daytime only a white contrail with much shorter range. Cloud cover, local horizon and trajectory all matter.

Nearby cities

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