CREATE TABLE table_4565 ("Higher harmonics" TEXT, "Darwin" TEXT, "Period" TEXT, "Speed" TEXT, "Doodson coefficients" TEXT, "NOAA" TEXT)

What higher harmonics have an NOAA of 8?
SELECT "Higher harmonics" FROM table_4565 WHERE "NOAA" = '8'
SELECT "Higher harmonics" FROM "table_4565" WHERE "NOAA" = '8'