be within a few degrees of the correct location. The galaxy M82 is not located near any bright stars but if you can imagine lines as shown in the above figure you could aim your telescope at the indicated area and most likely have M82 appear in the finder scope, i.e. The orange lines create a virtual box around M82’s location.

The blue lines represent the commonly drawn lines that depict the constellation - the Great Bear but most people only know the Big Dipper part. Using the bright stars in Ursa Major to imagine virtual guidelines to know where to look for the galaxy M82. This article conflates telescope and mount to just the word telescope to keep things simpler as well as naming conventions are not consistent most people refer to a particular type of telescope as a dobsonian telescope when in fact it’s a newtonian reflector telescope on a dobsonian mount. Except there is the problem of learning how to use them. For people looking to get in to observing they’re a great way to get a lot of optical performance at a good price. This has made a lot of older telescopes available as owners traded up to get the newer capabilities. What has changed with telescopes and their mounts in the past few decades is the incorporation of electro-mechanical systems to make them easier to use, either for aiming them or for tracking stars for taking pictures. Retrieved from Harvard College Observatory History in Images.Ģ0 year old telescopes, if well maintained, can provide optical performance as good as new telescopes. Sketches of Boston, past and present / and of some few places in its vicinity.

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