<Li> On National Day of Mourning (33rd Sunday of Ordinary Time). </Li> <Li> On any day of mourning by order of the federal president for all of Germany, or by order of a minister president for a particular state . E.g. upon the death of a current or former ranking politician or person of high esteem, or multiple deaths in accidents or natural disasters . </Li> <P> According to Law 851 / 1978, the only day specified on which the Greek flag is flown at half - mast is Good Friday . Also, on other national and public mourning days . </P> <P> Similar rules as in China apply for Hong Kong . See Flag of Hong Kong for details . Prior to the transfer of sovereignty in 1997, the rules for flying the flag at half - mast were the same as the British ones . </P>

Who has the authority to lower flags to half-staff