The variability of Delta Cephei was discovered in 1784 by astronomer
John Goodricke.
On this occasion, a day trip to Jodrell Bank was arranged with a second day based in York, with visits to the historic Observatory near the city centre (conducted by Martin Lunn), York Minster and to the location of the Treasurer's House, from where
John Goodricke first observed and discovered the variability of the stars Algol and 8 Cephei.
El primero en lanzar una hipotesis en ese sentido fue el ingles
John Goodricke (1764-1786).
In 1782 Algol was studied by a British astronomer,
John Goodricke (1764-1786), a deaf-mute.
John Goodricke discovered and tracked Delta's periodic variations in 1784; he speculated that they might be caused by dark marks on the star rotating in and out of view.
89 days in 1784, when
John Goodricke discovered its variations.
Its changes are obvious to the naked eye, but there is no good evidence that anyone ever noticed them before
John Goodricke discovered Algol's variability in 1782.
Argelander's variable-star work with his star cataloging and overlooks earlier work by
John Goodricke, Edward Piggott, William Herschel, and others.
That star's fluctuations were first detected in 1784 by English amateur
John Goodricke, another great pioneer of variable-star astronomy.
Named in honor of the 18th-century English amateur astronomers
John Goodricke and Edward Pigott, the facility is equipped with a Celestron 14-inch f/11 Schmidt-Cassegrain reflector and a homemade CCD camera that originally featured a high-efficiency SITe chip with a 512-pixel-square array.
Collaborating with Pigott was
John Goodricke, also in York, who was only 17 years old.
89 days, when first measured by
John Goodricke in 1784, to 12.
