"day of year" is a correct and usable phrase in written English.
It typically functions to provide the date of a specific day within the year. For example, "July 3rd is the 184th day of year."
It was the child's first day of year 1 in a new school.
It is known that RS varies with day of year, zenith angle, and net infrared radiation.
Three Dst indices are approximately − 100 nT on day of year (DOY) 77, 174, and 355.
Figure 6 Latitude vs. day of year variation of SABER temperature amplitudes.
Figure 7a shows the PRE peak V i as a function of day of year.
The optimal smoothers corresponded to Gaussian distributions with standard deviations of 6 and 253 days for the day-of-year and trend terms, respectively.
Fig. 5 a Aurora and IPT brightenings on day-of-year (DOY) 59.
The signals are from the same satellite but for two different times, day-of-year (doy) 287 and 291, 2012.
The dynamic SW pressure increased suddenly on day-of-year (DOY) −10, 11, 47, 66, and 74 in 2015.
For statistical analysis, the arithmetical mean day-of-year of onset of each stage was calculated for each treatment.
