|Dendrochronology||Dating using tree rings. Also a little about
carbon-14 and solar events.
||"A support community managed by the National
Archives for researchers, citizen historians, archival
professionals, and open government advocates."
||Not exactly what most of us think of as
"history", but a lot of good stuff that's old or very old.
World Factbook Maps
||Wide range of maps kept up-to-date
The True Story of a Lone Genius Who Solved the Greatest
Scientific Problem of His Time.
||Excellent book by Dava Sobel. Could
also belong in Time Keeping.
||all things geography|
Map Projections - types and distortion patterns
Free Educational and Spatial Data Resources
|Online mapping tools.
overview of time zones.
||Serious and very funny.
||This site could also be in Cartography or Geography.
||Large site of information including history,
calculations and links.
||NTP software, Public server pool
||The historical standard for GMT. 300
foot error. The actual observatory was closed in
explanation with extensive references.
(U.S. Naval Time Service Department)