Docs: fix cross reference in satellite page #375


	name: ci

	on:
	push:
	branches:
	- master
	- ci

	pull_request:
	branches:
	- master

	jobs:
	doctest-and-lint:
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: 3.6.15

	- name: Install pinned dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install astropy==3.0.1 docutils==0.17.1 matplotlib==3.3.0 numpy==1.15.4 pandas==1.0.0 pyflakes scipy==1.2.2 sphinx==1.7.2 spktype21

	- name: Install Skyfield
	run: \|
	python setup.py sdist
	pip install -e .

	- name: Doctest
	run: \|
	./test-docs.sh

	- name: Lint
	run: \|
	pyflakes $(find skyfield/ -name '*.py')

	test:
	runs-on: ubuntu-20.04
	strategy:
	fail-fast: false
	matrix:
	python: [python2, python3]

	steps:
	- uses: actions/checkout@v2

	- name: Install
	run: \|
	sudo apt install -q -q python3-virtualenv virtualenv
	virtualenv -p ${{matrix.python}} V

	- name: Build scripts
	run: \|
	cat <<'EOF' > GITHUB_INSTALL.sh
	source ./V/bin/activate
	echo PATH is $PATH
	which python
	python --version
	python -m pip install --upgrade pip
	python setup.py sdist
	python -m pip install dist/*
	python -m pip install mock pandas
	python -m pip install https://github.com/brandon-rhodes/assay/archive/master.zip
	EOF
	cat <<'EOF' > GITHUB_TEST.sh
	source ./V/bin/activate
	cd ci && ../test-code.sh
	EOF

	- name: Install
	run: \|
	bash -e -x GITHUB_INSTALL.sh

	- name: Test
	run: \|
	bash -e -x GITHUB_TEST.sh

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