How to study astrolabes? A computerized checklist to try and track down all known examples - 1973 style. Amazing achievement, and what an interface! (by Sharon Gibbs, Janice Henderson, Derek de Solla Price)

Returning to my online #astrolabe after several years to add Regiomontanus and Alchabitius cusps. Have to remind myself how these are defined. I take Regiomontanus' Tabulæ Directionum, Prob. 14 as my guide. Should have results soon. Stephen Johnston Seb Falk

New #astrolabe feature: A "presentation mode" button (small gray triangle, upper-right). This lets you access the toggle switches at the bottom of the page without having to scroll away from the astrolabe. Thank you Stephen Johnston for the suggestion! alexboxer.com/astrolabe

We are pleased to host an Open House for University of Oxford Freshers (undergraduate-level and graduate-level students) on Saturday, 30th November. To attend, please register by noon on Friday 29th November. Registration link: oxcis.ac.uk/form/ocis-open…

Event for the Oxford Centre for Islamic Studies and History of Science Museum exhibition "Lines of Faith: Astronomy and the Art of the Astrolabe in the Islamic World": Joumana Medlej Joumana is nuking this account soon leads a study day on Abjad numerals - Saturday 17 May. Full details at eventbrite.com/e/when-letters…