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    Re: Altitude correction using Artificial Horizon?
    From: David Pike
    Date: 2021 Jun 21, 10:08 -0700


    Well done on your choice of project.  It’s a subject with lots of opportuniie for research, both written and practical.  If you’re starting a project about artificial horizons, you need to begin by explaining which types you will look at, because there are several.  E.g., liquid, mirror, pendulous, bubble, and gyro.  Even within each type there are sub-sets.  E.g., type of liquid; is the silvering on front of the back of the mirror; and so on and so forth. 

    Although most artificial horizons follow the similar principles, there are subtle plays of accuracy versus practicality.  Some are best suited to static situations.  Others are more practical for use from a moving platform, or from a confined compartment where extreme accuracy might have to give way to practicality.  All methods have advantages, and all have snags.  None fit every criterion. 

    Also, you need to try a few methods, before stating hard and fast advantages.  E.g., Sun centre upon Sun centre with a mirror or liquid horizon sounds like it ought to be child’s play, but you’ll find your neighbour using limb edge to limb edge will get better results.  That’s because it’s much easier to make limbs just kiss together than to judge when two bodies are on top of each other.  On the other hand, if your neighbour gets their limbs mixed up, they could be out by half a degree.  Trying to observe a sickle Moon centre on centre might also be fun. I’ve never tried it. 

    Therefore, please give us a bit more detail about which AH you were thinking about, and I’m sure you’ll receive loads of advice from those of us with specialist experience using that method.  Best Wishes DaveP

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