## Mathematics

* 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)
  
* Eratosthenes method for determining the size of the Earth:
  * italian language: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/eratosthenes-it.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/eratosthenes-it.pdf)
  * english language: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/eratosthenes-en.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/eratosthenes-en.pdf)
  * with title and background
    * italian language [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/eratosthenes-infographic-it.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/eratosthenes-infographic-it.pdf)
    * english language [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/eratosthenes-infographic-en.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/eratosthenes-infographic-en.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)