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The ETX started out as a 90 mm (3-1/2") Maksutov Cassegrain telescope (first produced in 1996) and took advantage of high volume mass production and simplified optical and parts construction to open a new market for a cheap alternative to the very expensive Questar 3-1/2 Maksutov Cassegrain [1] [2] The ETX "line" has been expanded to 105 mm, and 125 mm Maksutov Cassegrains and achromatic ...
At Walmart, where it earned a 4.4-star rating, it’s on sale for $99, down from $110, for 10% savings. ... beyond the full-size model in the kitchen. It’s normally $139, but Walmart has slashed ...
The Venus tablet of Ammisaduqa (Enuma Anu Enlil Tablet 63) is the record of astronomical positions for Venus, as preserved in numerous cuneiform tablets dating from the first millennium BC. It is believed that this astronomical record was first compiled during the reign of King Ammisaduqa (or Ammizaduga), the fourth ruler after Hammurabi .
The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
See duplex option below. This was first offered for sale in May 1956. A 3.5" Duplex, optically and mechanically identical to the Standard, but which included a simple way of detaching the telescope from the open fork mount to allow the optical tube assembly (OTA) to be used as a 1240 mm at f12 telephoto lens. This variant has been in production ...
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A magnification of 10x is generally considered the practical limit for observation with handheld binoculars. Binoculars more powerful than 15×70 require support of some type. Much larger binoculars have been made by amateur telescope makers, essentially using two refracting or reflecting astronomical telescopes.
The Saturn V-D was a conceptual booster with the ability to launch three times as much payload as the Russian Energia booster. Studied in 1968, it was considered to be the mightiest of the proposed variations of the Saturn V rocket, rehashed as one of the boosters from the Boeing 1967 Saturn studies and utilizing the stage and a half Saturn V-B, four 100 ft tall SRBs, and the ordinary second ...