The following log includes the dates of publication and lists sections containing major updates for all current and past versions of the handbook. The current version is listed at the top in bold font.

v8.1.0 June 1, 2019 Observer's Handbook for Cycle 8 released.

New versions of the Observer's Handbook from Cycle 6 onward will follow the schedule of releases as demonstrated for Cycle 8 below:

Observer's Handbook Releases
Version Coincides with
8.1.0 Call for Proposals
8.1.1 Update to Call for Proposals
8.2.0 Phase II begins
8.2.x Phase II Concludes

Versions have the format (Observing Cycle).(Phase).(Revision). Intermediate revisions may be released until the conclusion of Phase II.

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