Looking to the stars on May the 4th: “Magnetic Variation and Star Maps”. ✨⭐️✨ Set of 6

Looking to the stars on May the 4th:
“Magnetic Variation and Star Maps”.
✨⭐️✨
Set of 6 colour chromolithographed circular maps (four celestial and two terrestrial), published by Colonel Sir Henry James, [London] 1861.