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time calculations

60 seconds = 1 minute [ mean solar ] 59.83617 seconds = 1 minute [ sidereal ] 60 minutes = 1 hour 24 hours = 1 day 3,600 seconds = 1 hour 86,400 seconds = 1 day [ mean solar ] 86,164.09 seconds = 1 day [ sidereal ] 7 days = 1 week 168 hours = 1 week 14 days = 1 fortnight 28, 29, 30 or 31 days = 1 month 365 days = 1 year 366 days = 1 leap year 12 months = 1 year 31,536,000 seconds = 1 year [ calendar ] 31,558,150 seconds = 1 year [ sidereal ] 31,556,930 seconds = 1 year [ tropical ] 9,460,550,000,000,000 metres = 1 light year 299,792,458 metres per second ( m/s ) = speed of light parsec = approx.
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AWS instance .pem file connection error

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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)! 93 more words

Networking