The two grids below are essentially equivalent. A specific color belongs to a specific category (four solid colors). Exception is the center box with 2 colors. Should be easy to fill out all the boxes with "?"
2 Answers
Partial answer
Green:
An overlined V. LI is Roman for 51. Numbers greater than 3,999 can be represented with Roman numerals with an overbar, which means the digit value is multiplied with 1,000.
White:
18:25. The white-and-red image on the left is the flag of Poland; the red-and-white image on the right is the flag of Indonesia. 13:25 is the time in Poland (CEST). Indonesia spans across three time zones, but when it's 13:25 in Warsaw, it's 18:25 in Jakarta.
Yellow:
Approximately 1.222. An angle of 940° (which really is 220°) corresponds to 16.4 radians. 70° correpsond to 1.222 radians.
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$\begingroup$ The planets are Jupiter -> Mars and the Moon -> Earth. Tried seeing if the numbers related to distance or size but neither give anything useful. $\endgroup$– n_plumCommented May 17, 2017 at 13:16
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$\begingroup$ Apologies n_palum and everybody, I calculated for another moon. Now corrected $\endgroup$– DrDCommented May 17, 2017 at 13:42
Partial answer
The green ? is probably MMMMM or the fancy V that equals 5000 in roman numerals. Because LI equals 51.