Cache is not at listed coordinates, but you could solve at home before you visit. Solar term is 24 points in traditional East Asian lunisolar calendars that matches a particular astronomical event or signifies some natural phenomenon. The points are spaced 15° apart along the ecliptic and are used by lunisolar calendars to stay synchronized with the seasons, which is crucial for agrarian societies. The solar terms are also used to calculate intercalary months in East Asian calendars; which month is repeated depends on the position of the sun at the time.
http://www.hko.gov.hk/gts/time/24solarterms.htm
Final: N22°26.ABC E114°10.PQR
A. White Dew is on which month?
B. Insects Waken is on which month?
C. Moderate Cold is on which month?
P. Vernal Equinox is on which month?
Q. Rain Water is on which month?
R. Great Heat is on which month?
(A+B+C)-(P+Q+R)=1