Just in case you want to build a clock with an Arduino..
http://jorisvr.nl/arduino_frequency.html
ADEV measurements, etc.
take home message.. absolute accuracy is a few kHz out of 16 MHz...
probably a 100 ppm crystal.
On some Arduinos (or Teensy3's which is what I use) there's a provision
for a 32kHz clock crystal.. that might be a bit better as a time base.
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