This book is a comprehensive reference on ancient Egyptian astronomy, one of the most important topics in historical astronomy. Written by two recognized specialists—one an astronomer trained in Egyptology and the other an Egyptologist trained in astronomy—it synthesizes and analyses the international body of research surrounding this ancient

A lo largo de la historia de la humanidad, las distintas culturas incorporaron cuerpos y fenómenos celestes a su folclore, dando cuenta de su interés y fascinación por el firmamento. En la actualidad, incluso cuando la observación de los movimientos de los astros no es necesaria en nuestro día a día para la ubicación en el tiempo y en el espacio

We report on the discovery of an Earth-sized transiting planet (R p = 1.015 ± 0.051 R ⊕) in a P = 4.02 day orbit around K2-415 (EPIC 211414619), an M5V star at 22 pc. The planet candidate was first identified by analyzing the light-curve data obtained by the K2 mission, and it is here shown to exist in the most recent data from TESS. Combining the

Accretion disks around compact objects are expected to enter an unstable phase at high luminosity 1. One instability may occur when the radiation pressure generated by accretion modifies the disk viscosity, resulting in the cyclic depletion and refilling of the inner disk on short timescales 2. Such a scenario, however, has only been quantitatively

Cosmological constraints on the sum of the neutrino masses can be relaxed if the number density of active neutrinos is reduced compared to the standard scenario, while at the same time keeping the effective number of neutrino species N eff \approx 3 by introducing a new component of dark radiation. We discuss a UV complete model to realise this

We present a rapid timing analysis of optical (HiPERCAM and ULTRACAM) and X-ray (NICER) observations of the X-ray transient Swift J1858.6-0814 during 2018 and 2019. The optical light curves show relatively slow, large amplitude (~1 mag in g s) 'blue' flares (i.e. stronger at shorter wavelengths) on time-scales of ~minutes as well as fast, small