Earth's shadow
... that the Earth's shadow can be observed during twilight hours?
... that the <b id="mwBRk"><a href="./Earth's_shadow" id="mwBRo" rel="mw:WikiLink" title="Earth's shadow">Earth's shadow</a></b> <i id="mwBRs">(pictured)</i> can be observed during <a href="./Twilight" id="mwBRw" rel="mw:WikiLink" title="Twilight">twilight</a> hours?