This led the Arecibo Telescope to access only a part of the sky with a range of 40 degrees in declination directly overhead the telescope. The dish was so large and had to remain fixed on the ground, while the Gregorian dome could move in position with a limited capability. The Arecibo Telescope was one of the primary instruments in pulsar searching, leading to the discovery of many pulsars, including highly stable millisecond pulsars that were ideal for NANOGrav-type sciences. Due to its size, the timing observations of pulsars obtained with the Arecibo Telescope were more sensitive than those with the GBT. The National Radio Astronomy Observatory (NRAO), Green Bank Observatory (GBO), and Raytheon Intelligence &. Given the enormous collecting area and the extensive observing frequency coverage, from 327 MHz to 10 GHz, with a 2-millimeter surface accuracy, the Arecibo Telescope was the most sensitive radio telescope in the world. The spherical aberration correction was done using its secondary optics in the Gregorian dome. The telescope had a 305-meter diameter spherical primary reflector, the size of 3 football fields, and could illuminate approximately 225 meters at a time. Gordon Telescope at the Arecibo Observatory in Puerto Rico was the second largest radio telescope in the world at the time of its collapse in December 2020. Roughly 5% of the total observing time of the Green Bank Telescope is reserved for monitoring the pulsars in our array. In addition to providing monthly timing observations of the millisecond pulsars in our array, the Green Bank Telescope is also used to search for possible new additions to our pulsar timing array through the Green Bank North Celestial Cap pulsar survey, among others. National Radio Quiet Zone, in which radio transmissions are regulated to limit the amount of interference that might adversely affect our observations. With its innovative design and location, the Green Bank Telescope can see 85% of the total sky, and is therefore critical to achieve the sky coverage necessary for our project. In the design stages was a most ambitious plan for the world’s largest equatorially-mounted. In the early days of the NRAO, the late 1950s, eager American radio astronomers wanted a giant radio telescope to call their own. It also has an unblocked primary mirror, which allows it to detect more radio emission in a comparable time to telescopes with more traditional designs. The 300-foot telescope in Green Bank, West Virginia was the largest telescope on Earth when it came online in 1962. With a 100 meter by 110 meter section of a 208 meter parabola, it has a reflecting surface of about 11,000 square meters and is thus the largest fully steerable telescope in the world. The Green Bank Telescope is located in Pocahontas County, West Virginia.
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