Astronomy | A 3D earth model written in swift playground using SceneKit | Math library

I am building a web application using AWS DynamoDB as the database for my application. To be honest I am quite a newbie to the AWS DyanmoDB. One of the reasons I use DynamoDB is because I want to learn it. Now, I am having a bit of a problem designing my tables around the one-to-many relationship.

Now, I have a table with the following attributes.

I have a table like this:

I want to capture the image tag of MediaWiki format, e.g,

[[ Image:Justus Sustermans - Portrait of Galileo Galilei (Uffizi).jpg|left|thumb|upright|[[Galileo]] is often referred to as the Father of [[modern astronomy]], portrait by [[Justus Sustermans]]]]

I have to ignore the inner [[...]] to match the whole (shown by bold [[ and ]]). I came up with

I am trying to map nested JSON, but I get 'Element implicitly has an 'any' type'.

The error happens in the search component at:

This is for an assignment in my object oriented programming class.

I am a beginner, especially with this language, so a lot of things could be wrong with this code.

For now, I am focusing on the error it keeps giving me when I run it: error CS0103: "The name `StudentList' does not exist in the current context."

I thought that by making my list public, this issue wouldn't occur.

It gives this error for every object that I try to add to the list in MainClass. This is my first time using lists in C#. Am I missing something pretty obvious? How do I fix this?

I am very much a beginner at C# and for some reason, my method is not doing what I want it to.

The method I am referring to is the Roll() method. I want it to print the class name and all of the students in the class list whenever I call the method. It doesn't do any of that. All it does is print "Roster:", leaving out the things I want it to print. Am I missing something? How can I fix this?

I have some experience in several programming languages, but I would like to try APL. I'm doing some tutorials, but I want to work in a practical example. I would like to read astronomical images from a file, in FITS format (a very common format for Astronomy data), and perform some calculations on them. An image is nothing but a big numerical matrix (mine are integers, but they could be doubles... this is not important, anyway). And each file can have one or several images (not only that, but also tables and metadata information). Once one of the images is loaded, a function with some computations would be applied to it.

I would like to know whether there is any library or package for APL with functions to perform this FITS file handling (reading, writing, modification, retrieval or change of metadata, extension, etc.), or if I should use a kind of wrapper using any other language (C, C++, Python, ...) with well established libraries to perform all the input/output, with a computational core in APL.

(I quick search in Google and in some APL oriented sites didn't yield to any valid result.)

How to handle large numbers in python and django models for mysql datatype? I want to store large decimal numbers e.g mass of the Sun in kg (1.98847±0.00007)×10^30 kg and other large numbers of physics and astronomy.

What max_digits and decimal_places will I need?

For simple longitude, latitude I use 11,6:

Okay, I build Game DB schema using astronomy package in meteor.

Then I try to add method to it by extending it in server. (server/gamehandle.js)