That small portion of graduated arc of a sextant in which graduations from zero read in a direction opposite to that of the main graduations.
Laa ndawana incinci yabathwalisileyo indwe kwisangqa sesixhobo sokulinganisa ukuphakama kwelanga ukufumana ubuphi benqanawa apho izithwala-ndwe ukusuka ku-0 ifunda kwicala elingalinyanga kwesasithwala-ndwe soqobo