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Phasis of 6 digits, the Semidiameters appear'd equal. These my Observations, if you think them worthy, you may communicate to other Mathematicians. The last year 1665. July 27. (st.n.) the Tables did also indicate an Eclipse of the Moon: but though the Sky here was very cleer, yet the Moon was not at all obscured by the true shadow, but entred only a little into the Penumbra, wherein it continued 50′. The beginning of its touching the Penumbra did then almost happen, when Aquila was elevated 36° 18′; which is an Example worthy to be noted. I have many Observations of the Eclipses of former years by me, which I could not yet make publick, by reason of the multitude of my business, which do almost over-whelm me. The Eclipse of the Moon of this Year 1666. June 16. (st. n.) was observed from a Hill neer my Garden, to the end, that we might see both together the Suns setting, and the Moon rising. But I was disappointed of my hopes. For very thick Exhalations, besieging the Horizon, where the Moon was to rise, unto 2°. 30′, hindred me from seeing the Moon rise, in the Article of the setting of the Sun. Wherefore the first Phasis of 1. dig. 45′. did not appear but in the Moons Altitude of 2°. 30′; when the greatest Obscuration was already past. The End fell out hor. 9. 27′, about 128° from the Zenith Westward.
I am very glad to understand, that you have so good Telescopes, as to make such considerable Observations in Jupiter and Mars, as you have lately done in England. I have no leasure now, by reason of the Observations of the Fixt Stars, which I now almost constantly am employ'd about, to do any thing in the advancing of Telescopes. I am obliged to finish the Catalogue of the Fixt Stars; having mean while the contentment to find, that many excellent persons labour about the Improvement of 0ptick Glasses. If I could get a good one of those of 60. foot, you mention, at a reasonable rate, you would oblige me in sending me one; perhaps may I be so happy, as to make likewise some good discovery or other, by the help thereof. In the mean time, let me know, I pray, the Dimensions of those Glasses, and how they are to be managed. The ingenious Burattini has not yet finisht his Telescope; as soon
