Close to sunset and sunrise bright stars like Sirius or even Canopus can be spotted with the naked eye as long as one knows the exact position in which to look. Historically, the zenith of naked-eye astronomy was the work of Tycho Brahe (1546â1601).
The egg sac, irregular in shape, about the size of a tennis ball, is often seen in the garden, suspended by silk threads. Spider bite in southern Africa: diagnosis and management: the diagnosis of spider bite, especially when the patient is unaware of having been bitten, can be difficult
The yolk sac provides nutrition to the developing embryo until the placenta takes over, and is thus an important indicator of pregnancy health. In some cases, a gestational sac will be detected on ultrasound, but a yolk sac is subsequently not found. In other cases, an ultrasound may demonstrate that the gestational sac is abnormally shaped or not increasing as it should, by about 1 mm per day in early pregnancy. In yet other cases, the sac is abnormally shaped. Normal gestational sacs are round or oval and located within the mid-portion, or fundus, of the uterus.