Mathematics

• Hutton's formula: tex source | pdf
• Strassnitzky's formula: tex source | pdf

Astronomy

• Equinoxes and solstices:

  • italian language: tex source | pdf
  • english language: tex source | pdf

• Eratosthenes method for determining the size of the Earth:

  • italian language: tex source | pdf
  • english language: tex source | pdf
  • with title and background
    • italian language tex source | pdf
    • english language tex source | pdf

• Spacetime deformation by a black hole: tex source | pdf

• Percorso del Sole nel cielo:

  • dall'equatore: tex source | pdf
  • dal circolo artico tex source | pdf

Graphics

• A rocket: tex source | pdf

Physics

• Risposta relativa dei coni dell'occhio: tex source | pdf
• Riflessione e rifrazione: tex source | pdf