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The Top of descent (TOD) calculator is based on aviation rules of thumb and trigonometry. The main parameters we should have are origin altitude, destination altitude, and glideslope. The calculator can be found on https://descent.now.com/epranka/descent-app. The source code of the calculator is found at my GitHub repository: GitHub. If you have any questions, feel free to ask in the comments below or contact me directly. Follow on Twitter, GitHub, and let’s connect on LinkedIn.