In this paper, we present a physical modeling activity whose objective is to allow students to determine the differences between a disk and a sphere using pure scientific criteria. Thereunto, we reproduce the Sun-Earth-Moon system with low-cost materials and compare the illumination effects on the Moon considering two possible shapes for it (a…

In this work we describe a teaching proposal to calculate the eccentricity of the Moon's trajectory by applying a geometrical technique. The values of the ratios between the Earth-Moon distance and the diameter of the Moon at apogee and at perigee were calculated from a kinematic model associated with a geometrical technique of image analysis. The…

Explains the use of proximity operators as a search technique in online searching, especially in large full-text databases. Differences in proximity operators on various online systems are discussed and future possibilities are considered. (LRW)

In her second semester teaching for Arizona State University, the author suddenly found herself teaching a fully online writing course for the first time. Originally she had been scheduled to teach the course in a hybrid format, meeting face to face with students once a week; however, a coding error in the online class schedule resulted in the…