A notebook of useful things

Author: Ivan Debono (Page 3 of 8)

Musica universalis (9) – The speed of light

Bas & Ram (2006), Speed Of Light



Albert Abraham Michelson, Measurement of the Velocity of Light Between Mount Wilson and Mount San Antonio and references.

Musica universalis (8) – Spacetime

Ascania (2013), Spacetime



Albert Einstein (1905), Zur Elektrodynamik bewegter Körper

Henri Poincaré (1905/6), Sur la dynamique de l’électron

Hermann Minkowski (1907/8), Die Grundgleichungen für die elektromagnetischen Vorgänge in bewegten Körpern

Musica universalis (6) – Dark energy

Oliver Lieb (2014), Dark Energy



Observational evidence from supernovae for an accelerating universe and a cosmological constant

Measurements of Omega and Lambda from 42 high redshift supernovae



Musica universalis (4) – Gravitation

Alexander Popov (2012), Attractive force



Isaac Newton, Philosophiæ naturalis principia mathematica

Albert Einstein, Die Grundlage der allgemeinen Relativitätstheorie

The first photograph of the Moon…

…and the birth of astrophotography.

The earliest known photograph of the Moon was taken by John William Draper in 1839 or 1840. Draper, an Englishman by birth, was a chemistry professor at New York University at the time. This silver platinum plate of the Moon was the first of a series he shot through his telescope.

First known photograph of the moon

From this: Probably the first photograph of the moon, 1839


In 2013, the Hubble Space Telescope took a picture of the farthest galaxy ever discovered,  the dwarf galaxy z8_GND_5296. Since far=old (that’s 13.1 billion years old), it also holds the record for the oldest object ever photographed using visible light.

To this: A photo of the farthest galaxy ever discovered, 2013.

To this: A photo of the farthest galaxy ever discovered, 2013.


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