GET /iss/tle
获取国际空间站的两行轨道元素 (TLE) 集——描述卫星轨道的标准格式。TLE 数据包括轨道倾角、偏心率、近地点幅角、平均运动和历元。由卫星追踪软件（如 SGP4 传播器）使用，以预测 ISS 在任何未来时刻的位置。对构建自定义轨道预测工具和过境时间计算器至关重要。
curl https://nordapi.ee/api/v1/iss/tle
HTTP 500: "# UndefinedFunctionError at GET /api/v1/iss/tle\n\nException:\n\n ** (UndefinedFunctionError) function App.IssPass.get_tle/0 is undefined (module App.IssPass is not available)\n (app 0.1.0) App.IssPass.get_tle()\n (app 0.1.0) lib/app_web/controllers/api/v1/iss_pass_controller.ex:13: AppWeb.API.V1.IssPassController.tle/2\n (app 0.1.0) lib/app_web/controllers/api/v1/iss_pass_controller.ex:1: AppWeb.API.V1.IssPassController.action/2\n (app 0.1.0) lib/app_web/controllers/api/v1/iss_pass_controller.ex:1: AppWeb.API.V1.IssPassController.phoenix_controller_pipeline/2\n (phoenix 1.8.5) lib/phoenix/router.ex:416: Phoenix.Router.__call__/5\n (app 0.1.0) lib/app_web/endpoint.ex:1: AppWeb.Endpoint.plug_builder_call/2\n (app 0.1.0) deps/plug/lib/plug/debugger.ex:155: AppWeb.Endpoint.\"call (overridable 3)\"/2\n (app 0.1.0) lib/app_web/endpoint.ex:1: AppWeb.Endpoint.call/2\n (phoenix 1.8.5) lib/phoenix/endpoint/sync_code_reload_plug.ex:22: Phoenix.Endpoint.SyncCodeReloadPlug.do_call/4\n (bandit 1.10.4) lib/bandit/pipeline.ex:131: Bandit.Pipeline.call_plug!/2\n (bandit 1.10.4) lib/bandit/pipeline.ex:42: Bandit.Pipeline.run/5\n (bandit 1.10.4) lib/bandit/http1/handler.ex:13: Bandit.HTTP1.Handler.handle_data/3\n (bandit 1.10.4) lib/bandit/delegating_handler.ex:18: Bandit.DelegatingHandler.handle_data/3\n (bandit 1.10.4) lib/bandit/delegating_handler.ex:8: Bandit.DelegatingHandler.handle_continue/2\n (stdlib 7.3) gen_server.erl:2424: :gen_server.try_handle_continue/3\n (stdlib 7.3) gen_server.erl:2291: :gen_server.loop/4\n (stdlib 7.3) proc_lib.erl:333: :proc_lib.init_p_do_apply/3\n \n\n## Connection details\n\n### Params\n\n %{}\n\n### Request info\n\n * URI: http://localhost:4000/api/v1/iss/tle\n * Query string: \n\n### Headers\n \n * accept-encoding: gzip\n * host: localhost:4000\n * user-agent: req/0.5.17\n\n### Session\n\n %{}\n"