We use ASAS V-band and ASAS-SN g-band observations to model the long-period detached eclipsing binary ASASSN-21co. show an eclipse of depth V ~ 0.6 mag in April 2009. from March 2021 similar duration depth, suggesting orbital period 11.9 years. combine with additional BVRI photometry taken during using PHOEBE. find that system is best described by two M giants a ratio secondary radius primary ~...

As the study of ionospheric behavior during various solar activities is an important task, studies changes eclipse events have been widely performed in different regions globe. This paper investigates responses to on 22 July 2009 over Nepal using total electron content (TEC) measured by dual-frequency Global Positioning System (GPS) receivers. The time-averaged Vertical TEC (vTEC) ten GPS stati...

A total solar eclipse occurred at the ascending node of Moon's orbit on 2 July 2019, with an magnitude 1.0459. The totality was visible from southern Pacific Ocean east New Zealand to Coquimbo Region (Chile) and Central Argentina sunset, maximum 4 min 32 s Ocean. recent Great American Eclipse, 21 August 2017, clearly showed that ionosphere is strongly affected by totality. In order explore iono...