| During the year 994 al-Khujandi used the very large instrument to observe a series of meridian transits of the sun near the solstices. |
| They aligned their buildings with celestial movements, marking where the sun rose at the summer and winter solstices. |
| It also has links to detailed information explaining sunrise, sunset, the solstices and equinoxes. |
| He explained eclipses, solstices and equinoxes, announced the sphericity of the earth and its diurnal revolution on its axis. |
| As a result, the actual occurrence of the equinoxes and solstices slowly moved away from their calendar dates. |
| The Vesica Piscis represents the summer and winter solstices of this cycle. |
