Showing papers by "Royal Institute and Observatory of the Spanish Navy published in 2016"
TL;DR: The data of the solar semidiameter from 1773 to 2006, making up an extensive new database for solar-radius measurements, which can be considered as mentioned in this paper, are analyzed to reveal any significant long-term trends, but no such trends were found.
Abstract: The solar diameter has been monitored at the Royal Observatory of the Spanish Navy (today the Real Instituto y Observatorio de la Armada: ROA) almost continuously since its creation in 1753 (i.e. during the past 250 years). After a painstaking effort to collect data in the historical archive of this institution, we present here the data of the solar semidiameter from 1773 to 2006, making up an extensive new database for solar-radius measurements, which can be considered. We have calculated the solar semidiameter from the transit times registered by the observers (except for values of the solar radius from the modern Danjon astrolabe, which were published by ROA). These data were analysed to reveal any significant long-term trends, but no such trends were found. Therefore, the data sample confirms the constancy of the solar diameter during the past 250 years (approximately) within instrumental and methodological limits. Moreover, no relationship between solar radius and the new sunspot-number index has been found from measurements of the ROA. Finally, the mean value for the solar semidiameter (with one standard deviation) calculated from the observations made in the ROA (1773 – 2006), after applying corrections for refraction and diffraction, is equal to $958.87^{\prime\prime}\pm1.77^{\prime\prime}$
.
12 citations
TL;DR: This work shows how the quality of bibliographic records could be improved, not only by adding more specialized description fields, but also by ensuring that the existing ones are being properly used by cataloguers.
Abstract: A sample of 18th, 19th and 20th-Century historical star atlases from the Royal Institute and Observatory of the Spanish Navy and the Linda Hall Library have been selected in order to identify the most frequently supplied scientific information. This work shows how the quality of bibliographic records could be improved, not only by adding more specialized description fields, but also by ensuring that the existing ones are being properly used by cataloguers. A series of new technical parameters is proposed, along with guidelines on how to find them, thus making the task of identifying such parameters easier for cataloguers.
7 citations
04 Apr 2016
TL;DR: The results of the 2015 calibration computation of Triangle Closure Calibration (TCC) are presented and the uncertainties are usually below 2 ns.
Abstract: Two-Way Satellite Time and Frequency Transfer (TWSTFT or TW) is one of the primary time transfer techniques for UTC generation. In this framework the Triangle Closure Calibration (TCC) method has been used to calibrate links between certain laboratories whose links to the pivot lab are directly calibrated. TCC is based upon requiring the closure of three co-joined links to be zero. In this paper, the results of the 2015 calibration computation are presented. The uncertainties are usually below 2 ns.
5 citations