Answer:
Astronomical observations and mathematics helped Egyptian farmers to measure the seeding and harvest times as it is described in the following excerpt:
"On a more practical level, the stars could tell one when it was going to rain, when it was nearing time to plant or harvest crops, and even the best times for making important decisions such as building a home or temple or starting a business venture. Astronomical observations led to astrological interpretations which may have been adopted from Mesopotamian sources via trade. Strictly astronomical examination of the night skies, however, were interpreted in terms of pragmatism and recorded in mathematical calculations measuring weeks, months, and years."
Reference:
Mark, Joshua J. “Ancient Egyptian Science & Technology.” Ancient History Encyclopedia, Ancient History Encyclopedia, 18 Oct. 2019,