今日星空：8月21日星期五，土卫六（Titan）靠近土星（Saturn），土卫四（Dione）掠过

本文介绍了8月21日的天文观测指南，重点关注土星及其卫星的运行动态。观测者可在清晨的东南方天空中，利用望远镜观测到土星、土卫六与土卫四的近距离接触。

Looking for a sky event this week? Check out our full Sky This Week column.  August 20: Dark, flat Plato Turn your gaze southeast early this morning to find Saturn already some 30° high, shining so brightly it’s easy to pick out among the dim stars populating this region. You’ll want a telescope — even a small Continue reading "The Sky Today on Friday, August 21: Titan nears Saturn as Dione skims past" The post The Sky Today on Friday, August 21: Titan nears Saturn as Dione skims past appeared first on Astronomy Magazine .