https://www.harborfreight.com/brass-sextant-66096.html https://www.harborfreight.com/brass-sextant-66096.html That is a typical 'decorative object', not a sext

https://www.harborfreight.com/brass-sextant-66096.html https://www.harborfreight.com/brass-sextant-66096.html That is a typical 'decorative object', not a sextant fit for purpose. They've been flooding auction sites in hundreds of variations, often 'antiqued' and made to look superficially like real 150 year old sextants. Imagine staring into the sun through that telescope using only that coloured green glass as a filter. Goodbye retina!