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Astronomers used the cross-staff for measuring the angle between the directions of two stars. Other, older instruments for this purpose existed, used by scholars such as Hipparchos and Ptolemy, but none was as portable, which made the cross-staff eminently suitable for navigation at sea.
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www-istp.gsfc.nasa.gov/stargaze/Scrostaf.htm
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Jacob's staff - Wikipedia, the free encyclopedia
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The Jacob's staff , also called a cross-staff , a ballastella or a fore-staff , is used to refer to several things. This can lead to considerable confusion unless one clarifies the purpose for...
en.wikipedia.org/wiki/Jacob's_staff
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The cross staff is an ancient instrument to measure angular size or angular separation. We will use it to determine the angular separation of the stars in the Big Dipper. You will need the template on the following page, file folder or poster board, glue, a scissors or knife, and a yard stick.
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www.physics.sfasu.edu/markworth/cross-staff.htm
www.physics.sfasu.edu/markworth/cross-staff.htm
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The Cross-Staff ... The cross-staff was first described, as an astronomical tool, by the Medieval Jewish scholar Levi ben Gersohn about 1342. In order to accommodate a broad range of angles he used a long staff, and was probably aided by an assistant to move the cross-piece in taking measurements.
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www.humboldt.edu/~rap1/EarlySciInstSite/Instruments/X-S...
www.humboldt.edu/~rap1/EarlySciInstSite/Instruments/X-Staff/X-staff.html
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Britannica online encyclopedia article on cross-staff (measurement instrument), ...the vertical, rather than the horizontal, but conversion of the readings was an elementary matter. ... The mariner’s astrolabe, however, was less widely used than its 16th-century successor, the cross-staff, a simple device consisting of...
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www.britannica.com/EBchecked/topic/144187/cross-staff
www.britannica.com/EBchecked/topic/144187/cross-staff
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Cross Staff and North Star ... Amerigo Vespucci was one of the sailors that used the cross staff to determine the latitude when they were in the middle of the ocean. The cross staff is an instrument that was usually made of wood and when used properly would help the sailors know how far north or south from the equator...
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www.calstatela.edu/faculty/eviau/edit557/vespucci/gerar...
www.calstatela.edu/faculty/eviau/edit557/vespucci/gerardo/gsailpg5.htm
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Red Cross staff, Shanmugalingam 37 and Chandramohan 26, both from the Tamil-speaking Eastern district of Batticaloa, were abducted from the crowded Fort Railway station at 6 m on Friday, by plainclothesmen who claimed to be from the Crime Investigation Department (CID) of the police.
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www.hindustantimes.com/StoryPage/StoryPage.aspx?id=4e09...
www.hindustantimes.com/StoryPage/StoryPage.aspx?id=4e09cf9f-a0fa-4b2f-8fba-2da2a4ed4885&&Headline=Killing+of+Red+Cross+staff+ahead+of+EU+meet+worries+Lanka
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Two Sri Lankan Red Cross staff abducted from the capital Colombo have been killed, the aid group says. ... Two Sri Lankan Red Cross volunteers who had been abducted in the capital, Colombo, have been shot dead, the aid group has said.
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news.bbc.co.uk/go/rss/-/2/hi/south_asia/6716557.stm
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One of the things I noticed was that the Holy Father was using a new Cross staff. Here is an image of him giving the final blessing, though it was already fading to a shot of the whole piazza… which is nice, in a way.
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wdtprs.com/blog/2008/03/benedict-xvis-palm-sunday-mass-...
wdtprs.com/blog/2008/03/benedict-xvis-palm-sunday-mass-new-cross-staff-images/
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