## 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)

* Spacetime deformation by a black hole: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/spacetime_deformation.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/spacetime_deformation.pdf)

* Percorso del Sole nel cielo:
  * dall'equatore: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/crepuscolo_equatore.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/crepuscolo01_equatore.pdf)
  * dal circolo artico [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/crepuscolo_circolo_artico.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/crepuscolo02_circolo_artico.pdf)

* Diffusione della luce da parte dell'atmosfera: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/diffusione_luce.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/diffusione_luce.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)

## Physics

* Risposta relativa dei coni dell'occhio: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/risposta_coni.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/risposta_coni.pdf)
* Riflessione e rifrazione: [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/riflessione-rifrazione.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/pdf/riflessione-rifrazione.pdf)