The current official MISC@1 calendar begins on the vernal equinox as determined by astronomical calculations for the ORGANIZATION@1 meridian -LRB- NUMBER@1 ° E or MISC@2 +3.5 h -RRB- .

Each year starts on the vernal equinox as precisely determined by astronomical observations from LOCATION@1 -LRB- or the NUMBER@1 ° E meridian , which also defines IRST -RRB- and LOCATION@2 .
