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 is the first anatomical structure identified within the gestational sac.It plays a critical role in embryonal development by providing nutrients, serving as the site of initial haematopoiesis, and contributing to the development of fetal gastrointestinal and reproductive systems 2. yolk sac appears as a circular anechoic structure within gestational sac, but outside the amniotic membrane. 2  yolk sac should be seen when the mean sac diameter (MSD) is 20 mm on transabdominal scanning and is usually seen endovaginally with an MSD of 8-10 mm.