Results 31 to 40 of about 9,274 (195)
The First Three Rungs of the Cosmological Distance Ladder [PDF]
, 2011 It is straightforward to determine the size of the Earth and the distance to the Moon without making use of a telescope. The methods have been known since the 3rd century BC. However, few amateur or professional astronomers have worked this out from data
Agnes Bischoff-Kim +8 more
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3D MODELING FROM GNOMONIC PROJECTIONS [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2012 Abstract. The paper presents a strategy able to derive and process high resolution images created by means of gnomonic projections. The implemented pipeline can be split into two phases: first, the sensor resolution of the camera is physically increased by acquiring and merging a set of images with a rotating camera equipped with a long focal lens ...
BARAZZETTI, LUIGI +2 more
openaire +4 more sources
Sundial-water clock of the Bronze Age (Northern Black Sea Region) [PDF]
Archaeoastronomy and Ancient Technologies, 2021 This article presents the results of a study of signs on a Bronze Age slab discovered in the vicinity of a heavily plowed mound near the settlement of Pyatikhatki. The slab belongs to the Dolmen archaeological culture.
Vodolazhskaya, L.N. +2 more
doaj +1 more source
The Drawing of Measurable Space and of Calculable Space
Diségno, 2020 In the third century BC, it happened that Eratosthenes of Cyrene (a city located in today's Libya) wanted to measure the radius of the earth, and he tried to do so using the instruments that were available to him at the time.
Francesca Fatta
doaj +1 more source
SpBase: the sea urchin genome database and web site [PDF]
, 2008 SpBase is a system of databases focused on the genomic information from sea urchins and related echinoderms. It is exposed to the public through a web site served with open source software (http://spbase.org/). The enterprise was undertaken to provide an
A. Yuan +24 more
core +4 more sources
La orientación del patio del colegio: un ejemplo para la indagación sobre Geografía en Educación Primaria [PDF]
, 2016 Realizamos una propuesta didáctica para organizar el patio del colegio a partir de la obtención de datos empíricos sobre los movimientos observables del Sol desde un lugar concreto en el planeta.
Limiñana, Rubén +5 more
core +1 more source
Estudios Atacameños, 2015 Se presentan los aspectos sociales vinculados al concepto de frontera, el ushnu y la observación lunar en el sitio inca de La Ciudacita, provincia de Tucumán, noroeste de Argentina.
Ricardo Fernando Moyano Vasconcellos +1 more
doaj +8 more sources
Orientation with a Viking sun-compass, a shadow-stick, and two calcite sunstones under various weather conditions. [PDF]
, 2013 It is widely accepted that Vikings used sun-compasses to derive true directions from the cast shadow of a gnomon. It has been hypothesized that when a cast shadow was not formed, Viking navigators relied on crude skylight polarimetry with the aid of ...
Barta +20 more
core +1 more source
A Study on Ganui-Dae’s External Form and Its Modeling for Restoration [PDF]
Journal of Astronomy and Space Sciences, 2013 Ganui-Dae, built in the reign of King Sejong, Joseon Dynasty, is a comprehensive observatory. It has various instruments for observation and time signal such as Ganui, Gyupyo(Gnomon), water-hammering type Honui and Honsang, and so on. Studying on Ganui-
Min-Soo Lee +3 more
doaj +1 more source
The astrometric recognition of the solar Clementine gnomon (1702)
, 2012 The Clementine gnomon has been built in 1702 to measure the Earth's obliquity variation. For this reason the pinhole was located in the walls of Diocletian's times (305 a.
Mazzucconi F. +2 more
core +1 more source