CREATE TABLE table_21092 ("Name" TEXT, "Latitude" TEXT, "Longitude" TEXT, "Diameter  ( km ) " TEXT, "Year named" FLOAT, "Name origin" TEXT)

Grechukha Tholi has what longitude?
SELECT "Longitude" FROM table_21092 WHERE "Name" = 'Grechukha Tholi'
SELECT "Longitude" FROM "table_21092" WHERE "Name" = 'Grechukha Tholi'