Human activity is rapidly increasing the negative impact of artificial skyglow at even the most remote professional observatory sites. Assessment of the actual impact requires an understanding of the propagation as a function of source spectral energy distribution. The higher blue content of light-emitting diodes being widely used as replacement for sodium discharge lamps has greater impact closer to the source, and less impact for more distant mountain-top sites. All-sky cameras with moderate angular resolution provide data and metrics sufficient to model and remove celestial contributions and provide measures of artificial light contribution. The natural skyglow is significantly affected by solar activity, which must be accounted for in determining secular trends in the artificial component. With the availability of the New World Atlas of the Artificial Sky Brightness, a direct comparison is made of the modeled artificial contribution to the sites with the largest aperture telescopes, noting the possible systematic errors in individual cases. Population growth of the nearest urban centers allows a prediction of the change in that brightness over a decade. All site protections are effected primarily by national or regional regulation. A collection of worldwide regulations shows that most are leveraged off environmental protection statutes, while in the U.S., they are largely based on land-use zones. Particular examples are presented in more detail for Flagstaff, Arizona, and the Island of Hawai’i. The latest rapidly growing threat is that of reflected sunlight from large constellations of satellites in low-earth orbit. A snapshot is provided of that rapidly changing situation. In all cases, astronomers must become very proactive in educating the public about the cultural value of visual or naked eye astronomy as well as the science and the need for access to a dark night sky for astronomical research.

即使是在最偏远的专业天文台，人类活动也在迅速增加人工天辉的负面影响。评估实际影响需要了解作为源光谱能量分布函数的传播。被广泛用作钠放电灯替代品的发光二极管的较高蓝色含量对靠近光源的影响更大，而对更远的山顶站点的影响较小。具有中等角分辨率的全天空相机提供的数据和指标足以模拟和消除天体贡献，并提供人造光贡献的测量。自然天辉受到太阳活动的显着影响，在确定人造成分的长期趋势时必须考虑到这一点。随着人工天空亮度的新世界地图集的可用性，对具有最大孔径望远镜的站点的模拟人工贡献进行了直接比较，并注意到个别情况下可能的系统误差。最近的城市中心的人口增长可以预测十年来亮度的变化。所有场地保护主要受国家或地区法规的影响。一系列全球法规表明，大多数法规都是利用环境保护法规，而在美国，它们主要以土地使用区为基础。更详细地介绍了亚利桑那州弗拉格斯塔夫和夏威夷岛的具体示例。最新快速增长的威胁是来自低地球轨道上大型卫星星座的反射阳光。提供了快速变化的情况的快照。在任何情况下，天文学家都必须非常积极地向公众宣传视觉或肉眼天文学的文化价值以及科学以及进入黑暗夜空进行天文研究的必要性。