CREATE TABLE table_27730 ("Number" FLOAT, "Name" TEXT, "Vertices" TEXT, "Hypotenuse 0 c" TEXT, "Vertical 0 b" TEXT, "Horizontal 0 a" TEXT)

Name the horizontal 0 for ry
SELECT "Horizontal 0 a" FROM table_27730 WHERE "Hypotenuse 0 c" = '明弦（RY日月）'
SELECT "Horizontal 0 a" FROM "table_27730" WHERE "Hypotenuse 0 c" = '明弦（RY日月）'