Fil:Modified gregorian.svgDescriptionModified gregorian.svg English: By putting a plane mirror between the primary and secondary mirrors, and then integrate the secondary in the
Fil:Month - Knuckles (en).svgEnglish Knuckle mnemonic for the number of days in each month of the Gregorian Calendar. Each knuckle represents a 31-day month. We used to check month
Fil:Time bar 1to2000 gregjul.svgyears for proleptic gregorian and julian calendar. Automatically generated SVG PATH (Single purpose C program) copied by hand into SVG-File (inkscape), using
Fil:Diagram Reflector Gregorian.svgDescriptionDiagram Reflector Gregorian.svg English: Diagram of Gregorian reflector M1 = primary mirror (parabolid); M2 = secondary mirror (concave ellipsoid);
Fil:Dish antenna type gregorian.svgDescriptionDish antenna type gregorian.svg English: Dish antenna type gregorian Date 3 August 2018 Source Own work based on: [1] Special:Diff/307482036#Dish