Paste the solar term names and dates you read from an astronomical source, one per line, and the tool sorts them by date, measures each gap in days, and reports the average gap along with the longest and the shortest span. Add a reference date and it also names the span that holds it and the share of that span already elapsed, which helps when planning seasonal food or farm work around the terms.
Gaps are measured by subtracting calendar components directly, so the figures do not shift with the reader time zone, and spans that cross a leap day are counted in real days. Written as of October 2026, and every solar term date comes from your own input.
No table of the 24 solar term dates and no list of term-by-term foods or customs is provided. The dates move every year, so a fixed table would simply be wrong, and the customs differ by region and source with no single official list. Entering only a year to find the next term is not covered, and lunar date conversion is not performed.
Frequently Asked Questions
The 24 solar terms are set by the ecliptic longitude of the sun, so the same term shifts by a day or two from year to year. A hard-coded table would be wrong as soon as the year changes, so the dates you read from an astronomical source are pasted in instead.
The earth does not move around the sun at a constant speed, so the time it takes for the ecliptic longitude to advance 15 degrees differs. That is why some spans run 14 days and others 16.
Entering only a year to find the next term is not covered here. This tool takes solar term dates you already have and measures the gaps between them and the span holding your reference date.