Wiktionary
n. A calendar based on the movement of the Earth around the Sun, which defines the year. Dates indicate the position of the Earth during this revolution.
WordNet
n. a calendar based on solar cycles
Wikipedia
A solar calendar is a calendar whose dates indicate the position of Earth on its revolution around the Sun or, equivalently, the apparent position of the sun moving on the celestial sphere. The other commonly used system is a lunar calendar which dates the months based on cycles of the lunar phases. The Gregorian calendar, widely accepted as standard in the world, is an example of solar calendar.
Usage examples of "solar calendar".
In modern Western society we still make use of a solar calendar which was introduced in Europe in 1582 and is based on the best scientific knowledge then available: the famous Gregorian calendar.
It was a lunar calendar, and he'd charted it against the ancient solar calendar, the Gregorian.
The Mayan solar calendar is but one part of a three-calendar system.
Such studies had also made the Egyptians aware of the 365-day cycle of the seasons very early in their history and had given them an accurate solar calendar, while other civilizations of the time had struggled with the much more complicated lunar calendars.
Or a solar calendar that is accurate to the Earth's actual movement around the sun.