"Unknown Lacquerware" was unearthed at the Tomb of Ruyin Houzao in the Western Han Dynasty in Fuyang, Anhui Province in 1977. It has been verified that it is the earliest existing guillema in the world with a definite date. The display, using the shadow cast by its north ear at noon, can indicate the arrival of the winter solstice, spring equinox, summer solstice, and autumn equinox. The geographic latitude of this type of table is fixed, and it has been calculated that the tomb of Ruminghou Qi The applicable latitude of the Gui watch is exactly in the area from Changan to Ruming Hou Kingdom in the Han Dynasty. The subtlety of this Gui watch is that the positions of the four solar terms are not indicated by scales, but are implicitly embedded in wooden blocks and lacquerware. Some special patterns and positions. Regarding this table, which of the following statement is correct:. ['May indicate twenty-four solar terms.', 'The age of use is unknown.', 'Applicable to specific geographic locations.', 'The table is marked with a detailed time scale.']