David Appleyard's English Language User Guides and References

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attosecond [as]:
century:
day [d]:
day (sidereal):
decade:
femtosecond [fs]:
fortnight:
hour [h]:
hour (sidereal):
microsecond [µs]:
millennium:
millisecond [ms]:
minute [min]:
minute (sidereal):
month:
month (synodic):
nanosecond [ns]:
novennial:
octennial:
picosecond [ps]:
Planck time:
quindecennial:
quinquennial:
second [s]:
second (sidereal):
septennial:
shake:
week:
year [y]:
year (Julian):
year (leap):
year (sidereal):
year (tropical):