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But many kinds of careful observations of a lunar eclipse can hold scientific interest.For example, we can try to get a good indication of the size of Earth's shadow by timing when it first appears to encroach upon the disk of the moon and when the last vestige of the shadow moves off the moon's disk (referred to as "contact timings"). Fw-300 #ya-qn-sort h2 /* Breadcrumb */ #ya-question-breadcrumb #ya-question-breadcrumb i #ya-question-breadcrumb a #bc .ya-q-full-text, .ya-q-text #ya-question-detail h1 html[lang="zh-Hant-TW"] .ya-q-full-text, html[lang="zh-Hant-TW"] .ya-q-text, html[lang="zh-Hant-HK"] .ya-q-full-text, html[lang="zh-Hant-HK"] .ya-q-text html[lang="zh-Hant-TW"] #ya-question-detail h1, html[lang="zh-Hant-HK"] #ya-question-detail h1 #Stencil . Bdend-1g /* Trending Now */ /* Center Rail */ #ya-center-rail .profile-banner-default .ya-ba-title #Stencil . Bgc-lgr #ya-best-answer, #ya-qpage-msg, #ya-question-detail, li.ya-other-answer .tupwrap .comment-text /* Right Rail */ #Stencil . Bxsh-003-prpl #yai-q-answer, #ya-trending, #ya-related-questions h2. Fw-300 .qstn-title #ya-trending-questions-show-more, #ya-related-questions-show-more #ya-trending-questions-more, #ya-related-questions-more /* DMROS */ .Such crater timings can be used to estimate the enlargement of Earth's atmosphere due to airborn dust and volcanic ash.Even with the unaided eye, a lunar eclipse is pleasing to watch, but binoculars will certainly improve the view, though a small telescope is recommended. The beginning of a lunar eclipse happens simultaneously for every viewer, and the end will happen simultaneously for everyone, too. Hence, the simple schedule below holds for all places (the times differ only because of time zones).
S and Canada: Pacific (PST), Mountain (MST), Central (CST) and Eastern (EST).
But if a major volcanic eruption has recently injected particles into the stratosphere, the moon will likely appear very dark.
On the Indonesian island of Bali in November, a volcano called Mount Agung spewed ash 5.5 miles (8.8 kilometers) into the sky.
Another method is to time when selected craters are swept by the advancing shadow.
Using a standard list of lunar craters, one can carefully measure the exact time when each crater enters and leaves the umbral shadow.