add coordinate systems

build.zig

@@ -32,6 +32,12 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
 
+    _ = b.addModule("astroz.coordinates", .{
+        .root_source_file = b.path("src/coordinates.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
     const lib_unit_tests = b.addTest(.{
         .root_source_file = b.path("src/ccsds.zig"),
         .target = target,

src/coordinates.zig

@@ -0,0 +1,36 @@
+const std = @import("std");
+
+pub const Equatorial_Coordinate_System = struct {
+    declination: Declination,
+    right_ascension: Right_Ascension,
+
+    const Self = @This();
+
+    pub fn new(declination: Declination, right_ascension: Right_Ascension) Self {
+        return .{ .declination = declination, .right_ascension = right_ascension };
+    }
+};
+
+pub const Declination = struct {
+    degrees: u8,
+    arcminutes: u8,
+    arcseconds: f32,
+
+    const Self = @This();
+
+    pub fn new(degree: ?u8, arcminutes: ?u8, arcseconds: ?f32) Self {
+        return .{ .degree = degree orelse 0, .arcminutes = arcminutes orelse 0.0, .arcseconds = arcseconds orelse 0.0 };
+    }
+};
+
+pub const Right_Ascension = struct {
+    hours: u8,
+    minutes: u8,
+    seconds: f32,
+
+    const Self = @This();
+
+    pub fn new(hours: ?u8, minutes: ?u8, seconds: ?f32) Self {
+        return .{ .hours = hours orelse 0, .minutes = minutes orelse 0, .seconds = seconds orelse 0.0 };
+    }
+};