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Friday, 17 April 2020

Abbasid invasion of Asia Minor (806)

  April 17, 2020      No comments   Edit
Abbasid invasion of Asia Minor (806).
The Abbasid invasion of Asia Minor in 806 CE was an attack by the Abbasid Caliphate against the Byzantine Empire in southeastern and central Asia Minor. Soon after his accession in 802, the Byzantine emperor Nikephoros I ceased paying tribute to the Caliphate and attacked it. In retaliation, Harun al-Rashid, the Abbasid caliph, invaded Byzantium with a force far larger than any seen before. The Abbasid army met no opposition and raided at will, capturing several towns and fortresses, including Herakleia, whose fall was celebrated by the Caliph's propaganda. Nikephoros was forced to seek peace and resume paying tribute. Harun exacted a personal tax on the Emperor and his heir, Staurakios, as a token of their submission and withdrew. Almost immediately Nikephoros violated the peace terms, but Harun's preoccupation with a rebellion prevented reprisal. Harun's death, the Abbasid civil war, and Nikephoros' Bulgarian wars prevented the resumption of large-scale warfare for two decades.

Thursday, 16 April 2020

Vision in White

  April 16, 2020      No comments   Edit
Vision in White.
Vision in White is the first book of the Bride Quartet series of romance novels, written by Nora Roberts (pictured). After its April 2009 release, it spent two weeks atop one of the New York Times bestseller lists and reached number three on the USA Today bestseller list. In her career, Roberts has published more than 225 novels. Vision in White was one of ten Roberts novels published in 2009, including five new releases and five reprints. It marked her return to contemporary romance. Like several other Roberts novels, Vision in White explores how a protagonist balances a successful career with a dysfunctional family environment. The hero is a typical representation of the romance novel archetype of the professor, but in an unusual twist for a romance novel, he is the character who is ready for a commitment but must help the heroine overcome her fears. A downloadable casual-play computer game based on the book was introduced by I-Play in 2010.

Wednesday, 15 April 2020

Circumstellar habitable zone

  April 15, 2020      No comments   Edit
Circumstellar habitable zone.
Horologium is a constellation of six faintly visible stars in the southern celestial hemisphere. It was first described by the French astronomer Nicolas-Louis de Lacaille in 1756 and visualized by him as a clock with a pendulum and a second hand. The boundaries of Horologium (literally 'an instrument for telling the hour') were specified in 1922 by the International Astronomical Union, and it has since been one of their designated constellations. All parts of the constellation are visible to observers south of 23°N. The constellation's brightest star – and the only one brighter than an apparent magnitude of 4 – is Alpha Horologii (at 3.85), an ageing orange giant star that has swollen to around 11 times the diameter of the Sun. The long-period variable-brightness star, R Horologii (4.7 to 14.3), has one of the largest variations in brightness known for stars in the night sky visible to the unaided eye. Four star systems in the constellation are known to have exoplanets; one – Gliese 1061 – contains an exoplanet in its habitable zone.

Tuesday, 14 April 2020

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