Determining longitude is incredibly difficult--for humans. Are animals fooling us into thinking that they have bicoordinate maps? New experiments show that at least some creatures effortlessly solve the seemingly insoluble problem of longitude.

We present the first edition of a catalog of variable stars from OGLE-II Galac-tic Bulge data covering 3 years: 1997–1999. Typically 200–300 I band data points are available in 49 fields between −11 and 11 degrees in galactic longitude, total-ing roughly 11 square degrees in sky coverage. Photometry was obtained using the Difference Image Analysis (DIA) software and tied to the OGLE data base w...

Observational searches for asteroids orbiting near Earth’s triangular Lagrange points face unique obstacles. A population of such asteroids would occupy a large projected area on the sky (possibly hundreds of square degrees) and is not favorably placed with respect to the Sun. Here we examine the properties of synthetic populations of Earth “Trojans” in order to aid in the optimization of obser...

The unidentified TeV gamma-ray source MGRO J1908+06/HESS J1908+063 was observed with the VERITAS Imaging Atmospheric Cherenkov Array during October 2007 and May-June 2008. This extended source is located on the galactic plane at a galactic longitude of 40.45 degrees and has a hard TeV spectrum with an index of Γ≈2.08 [1]. The Very High Energy (VHE) gamma-ray flux was measured by H.E.S.S. out to...

In this paper, an optimal off-grid solar photovoltaic (PV)/hydrogen fuel cell (FC) (HFC) based energy system is proposed for renewable generation to supply electricity the end-user load demand in north-east (NE) Indian states. The modeled and simulated HOMER software. monthly average global horizontal radiation (GHSR) ambient temperature of NE states are found be 3.95–4.79 kWh/m 2 12.9–25.3 °C,...