Astrology: woo-woo fortunetelling.
Astronomy: science about observable universe.
Q: 415 years away traveling at 99700 kmh how many years does it take you
A: Its takes 415 years, that is the first thing in the problem that you state.
Take a moment, carefully read through your textbook what the problem you need to solve really is, think about it for a minute and then try again.
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