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 * Hutton's formula: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/hutton_formula.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/hutton_formula.pdf)
 * Strassnitzky's formula: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/strassnitzky_formula.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/strassnitzky_formula.pdf)
 
+## Astronomy
+
+* Equinoxes and solstices:
+  * italian language: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/equinox_solstice-it.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/equinozi_solstizi.pdf)
+  * english language: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/equinox_solstice-en.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/equinoxes_solstices.pdf)
+
 ## Graphics
 
 * A rocket: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/rocket.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/rocket.pdf)