File:Moodboard of Cosmia Nebula, for my personal page.png

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A mechanical calculator. Not sure which type. Looks very much like the [Facit Standard (1928)](https://it.wikipedia.org/wiki/File:Facit_mechanical_calculator.JPG)   A detail of [the triangulation of Hanover carried out under Gauss's supervision between 1820 and 1850](http://www.ams.org/publicoutreach/feature-column/fcarc-surveying-one) . The pink lines are part of the Hauptsystem (main system) laid out by Gauss himself in 1821-1825. From his *Collected Works*, Volume 9, p. 347.   A Chinese orrery. If you zoom in you can see some Chinese constellation names.   Another illustration of Gauss's survey, from [10 Deutsche Mark, Series 4, backside](https://de.wikipedia.org/wiki/Datei:10_DM_Serie4_Rueckseite.jpg)   A page from [*Thesaurus logarithmorum completus* (1st edition 1794, 90th edition 1924) by Jurij Vega](https://en.wikipedia.org/wiki/Jurij_Vega#Mathematical_accomplishments")   A part of the moon, at [region LAC-79, with Colombo Nomenclature](https://planetarynames.wr.usgs.gov/images/Lunar/lac_79_wac.pdf)  

The portrait of Cosmia is by leffenkitty  
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Author Cosmia Nebula

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4 April 2023

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current07:15, 4 April 2023Thumbnail for version as of 07:15, 4 April 20233,000 × 1,600 (3.63 MB)Cosmia NebulaUploaded while editing "User:Cosmia Nebula" on en.wikipedia.org
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