Here's why:
* Tables of Venus's period of revolution usually don't include negative signs. The period of revolution (the time it takes for a planet to orbit the Sun) is a positive value. A negative sign would be meaningless in this context.
* A negative sign could be a mistake or an indication of a specific measurement. Perhaps the table is showing data where a negative sign signifies a change or difference from a reference value.
* You need to provide the context of the table. Tell me:
* What is the table showing?
* What are the units of measurement?
* What are the other values in the table?
With more information, I can help you understand what the minus sign signifies in your table.
