Results 31 to 40 of about 18,055 (209)

Equalization of the Measurements of the Altitude, the Azimuth and the Time from Observation of Passages of Celestial Bodies [PDF]

TransNav, 2010
The article is describing the computational model serving equalization of the astronomical measurements accomplished to navigational and geodetic purposes.
Piotr Bobkiewicz
doaj  

The NOD3 software package: A graphical user interface-supported reduction package for single-dish radio continuum and polarisation observations

, 2017
The venerable NOD2 data reduction software package for single-dish radio continuum observations, developed for use at the 100-m Effelsberg radio telescope, has been successfully applied over many decades. Modern computing facilities call for a new design.
Beck, Rainer, Krause, Marita, Müller, Peter, Schmidt, Philip   +3 more
core   +1 more source

Astronomical Longitude and Azimuth Determinations. (George Darwin Lecture, delivered by Dr. N. E. Norlund, Assoc.R.A.S., on 1937 May 14.) [PDF]

Monthly Notices of the Royal Astronomical Society, 1937
exaly   +2 more sources

A correction method of encoder bias in satellite laser ranging system

Geodesy and Geodynamics, 2013
In a satellite laser ranging telescope system, well-aligned encoders of the elevation and azimuth axes are essential for tracking objects. However, it is very difficult and time-consuming to correct the bias between the absolute-position indices of the ...
Wang Peiyuan, Zhu Wei, Zou Tong, Guo Tangyong   +3 more
doaj   +1 more source

Search for torsional oscillations in isolated sunspots

, 2017
In this work we seek evidence for global torsional oscillations in alpha sunspots. We have used long time series of continuum intensity and magnetic field vector maps from the Helioseismic and Magnetic Imager (HMI) instrument on board the Solar Dynamics ...
Centeno, Rebecca, Griñón-Marín, Ana Belén, Socas-Navarro, Hector   +2 more
core   +1 more source

On the orientation of Roman towns in Italy [PDF]

, 2007
As is well known, several Roman sources report on the existence of a town foundation ritual, inherited from the Etruscans, which allegedly included astronomical references.
Magli, Giulio
core   +2 more sources

The Sun's position in the sky

, 2013
We express the position of the Sun in the sky as a function of time and the observer's geographic coordinates. Our method is based on applying rotation matrices to vectors describing points on the celestial sphere.
, , , , , , , Alejandro Jenkins, Arnol’d V I, Chandrasekhar S, Danby J M A, Dixon R T, d’Inverno R, Goyder R, Green R M, Green R M, Green R M, Halliday D, Khavrus V, Meeus J, Meeus J, Müller M, Probst O, Saemundsson T, Tyson N D, Vandyck M A, Vandyck M A, Waugh A E, Young A T   +28 more
core   +1 more source

Enhancing the Capability of a Ground-Based Optical Telescope for Thai National Space objects Observation ^†

Proceedings, 2020
Nowadays, the space operations environment have to face with space safety problems because of the growing of space debris in resident of space objects (RSOs) that can cause a catastrophic collision. In order to prevent debris-related risks in operational
Peerapong Torteeka, Pakawat Prasit, Kritsada Palee, Apichart Leckngam, Patcharin Kamsing   +4 more
doaj   +1 more source

Effect of Polarimetric Noise on the Estimation of Twist and Magnetic Energy of Force-Free Fields

, 2009
The force-free parameter $\alpha$, also known as helicity parameter or twist parameter, bears the same sign as the magnetic helicity under some restrictive conditions.
Ai, Arnaud, Bao, Burnette, Chandrasekhar, Hagino, Hagino, Jayant Joshi, Jones, Keller, Lites, Longcope, Low, Low, Makita, Martin, Martin, P. Venkatakrishnan, Parker, Pevtsov, Pevtsov, Pevtsov, Pevtsov, Rachkowsky, Rust, S'anchez Almeida, Sakurai, Sanjay Gosain, Sanjiv Kumar Tiwari, Sankarasubramanian, Socas-Navarro, Solanki, Staude, Stenflo, Stepanov, Unno   +35 more
core   +1 more source

Helical Electron Beam Micro‐Bunching by High‐Order Modes in a Micro‐Plasma Waveguide

Advanced Science, EarlyView.
ABSTRACT Electron acceleration by a high‐power Laguerre‐Gaussian pulse in a micro‐plasma waveguide is investigated. When the incident laser travels in the waveguide, electrons on the wall are extracted into the vacuum core and accelerated by the longitudinal field of the waveguide mode.
Xingju Guo, Longqing Yi
wiley   +1 more source