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Basic - (example: Hydraulic engineering) searches for the entered expression in an exact match with the entry - i.e. in the order in which the words follow each other.
Logical OR - (example: butterfly valve OR lattice disc) pages containing one, the other, or both of the entered keywords will be included in the results.
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Year (tropical) to day (sidereal)
Values for calculation
Time converter
Time converter from year (tropical) to day (sidereal)
