What is the unit used to measure the thickness of the ozone layer? Scientists measure the amount of ozone gas in a column of air. To measure this, they use Dobson units (DU). Dobson was one of the first scientists to research ozone. One Dobâ¦son unit indicates 0.01 millimeter thickness of ozone gas in a column.
By common definition, a year is the length of time the earth takes to revolve around the sun in its orbit. The total number of days in a year is approximated to be about 365.24 days. However, this length varies based on the mode calculation used. The year calendar used is in sync with the four seasons experienced.
Full Moon Dates-Universal Time. Year 2004 is a leap year, with 366 days. The latest prior leap year occurred in 2000 and the next will be in 2008. The reason for the leap year is to reconcile the earth's orbit around the sun.eap Year Status. Year 2004 is a leap year, with 366 days. The latest prior leap year occurred in 2000 and the next will be in 2008. The reason for the leap year is to reconcile the earth's orbit around the sun. By adding days to the year the seasons stay in step with the month's for each year.