Altitudes Collection

Astronomy / Greenwich 1911
GREENWICH OBSERVATORY The Astronomer Royal, Mr Frank Dyson, taking a reading with an altazimuth (a theodolite for determining the altitudes and azimuths of the heavens)

The use of a cross-staff
3732353 The use of a cross-staff; (add.info.: Engraving depicting the use of a cross-staff used to measure altitudes of celestial objects. Dated 17th Century.); Universal History Archive/UIG.

The use of a cross-staff
3732352 The use of a cross-staff; (add.info.: Engraving depicting the use of a cross-staff used to measure altitudes of celestial objects. Dated 16th Century.); Universal History Archive/UIG.

The use of a cross-staff
3740620 The use of a cross-staff; (add.info.: Engraving depicting the use of a cross-staff used to measure altitudes of celestial objects. Dated 17th Century.); Universal History Archive/UIG.

The use of a cross-staff
3740619 The use of a cross-staff; (add.info.: Engraving depicting the use of a cross-staff used to measure altitudes of celestial objects. Dated 19th Century.); Universal History Archive/UIG.

summer sunrise towards the vajont valley, the Friulian Dolomites and Oltre Piave Dolomites, Pordenone, Friuli Venezia Giulia, Italy

Clouds, Stratus Quietus (colour litho)
5198780 Clouds, Stratus Quietus (colour litho) by English School, (19th century); Private Collection; (add.info.: Stratus Quietus)

Engraving showing use of a cross staff used to measure altitudes of celestial objects, 19th century
Engraving depicting the use of a crossstaff

Surveying: Top: measuring angles using a quadrant. Bottom: obtaining levels and altitudes using Hulsiuss planimeter. From Levinus Hulsius Instrumentorum Mechanicorum, Frankfort-am-Main, 1605

Flight height of birds, historical art
Flight height of birds. Coloured historical artwork showing the maximum flight heights of various birds. The scale down the left edge of the image gives the altitude in metres

Astrolabe, computer artwork

Richman / Lady Peace Plane
Harry Richman, American aviator and actor, and his Lady Peace plane: he advocated flying at high altitudes

Worlds Chief Mountains
A comparative view of the principal mountains in the world with their altitudes

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Gazing at the summer sunrise over the Friulian Dolomites, one can't help but marvel at the beauty of the astral sphere. In the past, astronomers used cross staffs and astrolabes to measure altitudes of celestial objects, as depicted in a 19th-century engraving. Meanwhile, surveyors employed quadrants and levels to determine terrestrial altitudes and heights, as shown in historical art. From the lofty heights of the worlds chief mountains, such as the Vajont Valley, to the flight paths of birds and the Richman/Lady Peace Plane, altitude holds a significant role in both the cosmos and our daily lives. This image of a tranquil stratus quietus cloud adds an ethereal touch to the scene, reminding us of the ever-changing skies above Greenwich 1911.