Astronomy and Amateur Investigation Hobbies

Hobbies built around systematic amateur observation and equipment-assisted investigation of phenomena outside the observer's own household, an activity-participant hobby in Stebbins' typology. Belongs here: astronomy, amateur telescope making (the instrument-building hobby that supports amateur astronomy) and ghost hunting, grouped here because all three pursue a claimed or suspected phenomenon with dedicated observational equipment and a recording discipline, whatever the evidentiary standing of what is being investigated. Does not belong here: radio-based observation and monitoring, grouped under Radio and Signal Hobbies, where the equipment and technique tradition is distinct.