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    The Easter Full Moon


    The Moon is our nearest neighbour, and many people do not
    realise what a fascinating world it is. Its phases are also linked
    to the date of Easter, although not in a simple way!

    The commonly stated rule that Easter is the first Sunday after
    the first Full Moon following the vernal or spring equinox is
    not quite correct. Strictly speaking, these days, Easter is the first
    Sunday following the "Ecclesiastical Full Moon" date after March
    20th. Rather confusingly, the date of the Ecclesiastical Full Moon is
    determined from tables, and it may differ from the date of the real
    Full Moon by up to two days. This is because in June 325 AD,
    astronomers decided to approximate the true full moon dates for the
    Christian church, calling them Ecclesiastical Full Moons.
    Incidentally, March 20th was the date of the equinox in 325 AD.

    The possible dates for the relevant Ecclesiastical Full Moon,
    (known as the Paschal Full Moon), are March 21 through April 18.
    This gives a range of dates for Easter Sunday extending from
    March 27 through to April 24. Note that if the Ecclesiastical Full
    Moon falls on a Sunday, Easter is the following Sunday.

    This year, (2017), Full Moon is on Tuesday, April 11, so
    Easter Sunday will be the following Sunday - on April 16.

    Even with the naked eye, you can see bright regions and darker
    patches on the Moon. Use binoculars or a telescope and you will
    see a tremendous amount of detail. The large, dark plains are called
    'seas', but there has never been any water in them.

    Explore the Moon with us at the Planetarium - it's a rugged little
    world with mountains, valleys, and a vast number of circular walled
    structures called craters. Learn about the phases of the Moon,
    how it raises the ocean tides, how it regulates Earth's climate,
    and how it is slowly making our day longer.

Important Notice:
At the start of a Planetarium show, your eyes will take a few minutes to adapt to the dark. For this reason, latecomers cannot be admitted. To avoid this, please ensure that you arrive at least 15 minutes before the start time.

Admission Prices: £7.00 for adults, or £5.00 for children under 16.

PLEASE NOTE that we are unable to accept credit or debit cards at present.

This show is suitable for children age 6 and upwards.


As space in our star theatre is limited, visitors for the public presentations are strongly advised to book tickets in advance to avoid disappointment.

Tickets may be reserved by telephoning the Planetarium on 01243 774400, or the ticketline on 07818 297292.

If we are unable to deal with your telephone request for information immediately, please leave your name and telephone number and the nature of your enquiry and we shall call you back as soon as we can.

Tickets for the public presentations are also available, to personal callers only, from the Tourist Information Office in The Novium, Tower Street, Chichester.